Kuberg Challenger User manual

ENGLISH

OWNER’S MANUAL

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A word about this

safety manual

DEAR KUBERG CUSTOMER

Congratulations on your purchase of a KUBERG Challenger. You now own a state of the

art electric motorcycle that will give you endless thrills if you maintain it properly. We

welcome you to the community of KUBERG riders.

Your KUBERG Challenger is a performance motorcycle that should be treated with

caution and used in safe environments. The Challenger is highly adjustable and can be

set up speciﬁcally for the rider. Please do not allow the motorcycle to be used or adjusted

by other operators.

Your KUBERG Challenger is driven by a powerful electric motor, which requires experience

and careful handling. The speed and torque settings MUST be set to suit the abilities

of the rider. Please remember that even when the torque setting is set to a slow setting,

the torque on these motors is virtually instant. This means that opening the throttle

will propel the motorcycle to a rapid speed almost instantly. For developing good riding

skills this is a wonderful feature, as it will teach riders throttle control gradually with lower

power. If the maximum power and torque is set too aggressively, the rider may accelerate

to a speed he/she is not comfortable with. Your Challenger has great capabilities and

can grow with the skills of the rider to very high levels of performance, but it is important

to start slow and speed up as you improve.

KUBERG motorcycles (except the KUBERG Freerider Street) are designed for o road use

only and must not be used on public roads or sidewalks. Please check and obey all local

and state laws. KUBERG motorcycles should only be ridden in safe areas where all laws

are being followed and all required permissions are given.

KUBERG motorcycles are amazingly capable and can be used from the earliest stages

of learning to ride all the way through to veteran riders. The secret of learning to ride

well is to be able to ride a lot, and KUBERG motorcycles make this learning process very

gratifying for teenagers and adults alike. Thanks again for purchasing a KUBERG

motorcycle, and we hope you enjoy the ride!

Michal Kubanek

President, KUBERG s.r.o.

KUBERG s.r.o.

Zengrova 630/83

703 00 Ostrava – Vitkovice

Czech Republic

www.kuberg.com

2 CHALLENGER - OWNER‘S MANUAL 3

A word about this safety manual 3

Important symbols and terms 6

Safety advice 7

Electric drivetrain 7

Safe riding practices 8

Motorcycle overview 10

Speciﬁcations – 2021 KUBERG Challenger 11

Before ﬁrst ride 12

Unpacking and assembly 12

First setup 13

Break-in period 13

Motorcycle controls 14

Setting up your KUBERG Challenger for riding 15

Setting power & torque modes 15

Drive train 18

Adjusting chain tension 17

Motor performance 17

Weather eects on performance 17

Maintenance 18

Before each ride 19

Cleaning 19

Front wheel removal and installation 20

Rear wheel removal and installation 21

Front and rear brake adjustment 21

Brake squeal 22

Adjusting the suspension 22

Battery use, care and maintenance 24

Charging instructions 25

Battery removal and installation 26

Short term and long term storage 27

Battery disposal 27

Riding instructions & safety tips (beginner riders) 28

First ride (novice riders) 28

Learning to stand up 28

Correct riding technique 29

Protective equipment 30

Helmets 30

Clothing 30

Accessories 31

Limited warranty 32

Table of contents

Introduction

PLEASE READ THIS SAFETY INSTRUCTION MANUAL PRIOR TO OPERATION!

To ensure optimum performance from your new KUBERG motorcycle and to ensure safe

operation, it is important to fully understand the features of the motorcycle. This manual

contains IMPORTANT INFORMATION that every owner must fully understand. Please read

this manual carefully and completely before operating your KUBERG motorcycle. Do not

attempt to operate the motorcycle until you have attained adequate knowledge of its

controls and operating properties and until you have received training in proper and safe

riding techniques.

Motorcycles generally, as well as KUBERG electric motorcycles, are single–track vehicles.

The safe use and operation of such single–track vehicles depend on proper riding

techniques and the experience of their riders (operators).

Please read, understand and follow all Warning, Caution and Note notices on your

KUBERG electric motorcycle and those included in this Manual. If you do not understand

any of this important information, please contact your selling dealer/distributor or the

KUBERG Customer Service Department (Email: kuberg@kuberg.com, phone:

+420 608 757 353)

Prop 65 WARNING

CALIFORNIA PROPOSITION 65 WARNING: accessories contain lead and lead

compounds, chemicals known to the State of California to cause cancer and

reproductive harm. Batteries also contain chemicals known to the State of California

to cause cancer. Wash hands after handling.

Important symbols and terms

This Owner’s Manual uses the following symbols and terms to call your attention to

Warnings, Cautions and Notes:

WARNING!

A Warning indicates a potentially hazardous situation, which if not avoided, could

result in bodily injury or death, in addition to the damage of the property. Read the text

accompanying the warning to be aware of the speciﬁc hazard.

CAUTION!

A Caution indicates a potentially hazardous situation, which if not avoided, may result in

damage to equipment or an inadvertent system failure. Read the text accompanying the

Caution to be aware of the speciﬁc hazard and to avoid damage or system failure.

NOTE:

The text accompanying a Note provides helpful or other important related information.

Safety advice

WARNING!

Failure to obey all of the warnings & instructions contained in this manual may result in

serious injury or death and/or permanent damage to your KUBERG motorcycle.

Speed & torque settings

Your KUBERG Challenger features a power and torque control button that must be set

for the abilities of the rider. This must be set by the responsible supervising adult before

each and every ride. Instructing and practicing in a controlled situation will allow the rider

to learn how to operate the motorcycle safely. Go to page 16 to ﬁnd detailed instructions

on how to set up the dierent torque modes.

WARNING! ADULT SUPERVISION REQUIRED

This vehicle must be used in the presence of adult supervision to ensure that safe riding

practices are established and followed. Even though teenagers are of the recommended

age to use this vehicle, not all teenagers have the strength, skills or judgment needed

to operate this vehicle safely. Parents should permit continued use of this vehicle only if

they determine that their child or teenager has the ability and judgment to operate the

vehicle safely.

WARNING! OFFROAD USE ONLY

KUBERG motorcycles are designed primarily for OFF-ROAD use. Please check your local,

state and national regulations as to whether single–track, motorized electric vehicles are

legal for road use in your area. KUBERG Challenger is not homologated for road use in

the European Union.

WARNING! This motorcycle is for personal use only and is not intended for

commercial purposes. The use of this motorcycle for commercial purposes, such as

rentals, will void all warranties.

Electric drivetrain

The fully electric drivetrain of this motorcycle is dierent from any gasoline motorcycle,

in that:

1There is very little engine braking and no engine noise.

2When going into corners or coming to a stop the rider will be fully dependent

on the motorcycle brakes.

3Passers-by may not hear you approach – so extra caution should be taken.

Make yourself conspicuous in order to reduce the chance of other vehicle users

or pedestrians being unaware of you approaching.

4Be aware that your motorcycle is still ON when stopped and while at an “idle”.

Accidentally twisting the throttle can cause serious harm.

WARNING! Accidentally twisting the throttle can cause serious harm.

6 CHALLENGER - OWNER‘S MANUAL 7

Safe riding practices

1SINGLE OPERATOR ONLY! No passengers!

2Long hair, loose clothing or items worn by the rider must be covered to prevent

entanglement in moving parts of the vehicle or the surroundings whilst riding

3Do not exceed the weight limit. Heavier riders may signiﬁcantly reduce performance

and/or render the vehicle unstable and/or over-tax the brakes and other control

devices. Heavier riders may cause structural damage not covered by the warranty.

4Do not touch any moving or hot parts.

5DO NOT RIDE AT NIGHT OR UNDER LOW VISIBILITY CONDITIONS. The KUBERG

Challenger is not equipped with lights.

6Do not immerse this vehicle in water.

7Do not ride on steep or uneven surfaces. Steep or uneven surfaces greatly increase

the likelihood of loss-of-control.

8Do not ride faster than the conditions permit for safe operation. Excess speed

greatly increases the likelihood of loss-of-control.

9The rider should have one leg on the foot peg ready to ride before turning the power

switch on.

Ride where other motorists, pedestrians and cyclists can see you. Avoid riding in another

motorist’s blind spot. Know your skills and limits. Stay within your limits in order to avoid

an accident.

NOTE:

Many motorcycle accidents are caused by rider error. A typical error made by motorcycle

riders is veering wide on a turn due to EXCESSIVE SPEED or under cornering due to

insucient lean angle for the given speed.

WARNING!

Maintain a proper posture while riding. The posture of the rider is important for proper

control of the motorcycle. The rider should keep both hands on the handlebars and both

feet on the foot pegs during operation in order to maintain control of the motorcycle.

Never ride under the inﬂuence of alcohol or other drugs. Go to page 27 to ﬁnd detailed

instructions concerning proper riding technique.

One rider only

Your motorcycle was engineered to carry one rider and no (0) passengers. Carrying

a passenger would overload the motorcycle and alter the handling. Do not allow this

to happen.

Do not overload the motorcycle

Exceeding the weight limitations will adversely aect the handling of the motorcycle,

and potentially cause damage.

Obey all laws

Obey all laws. KUBERG bikes are for OFF-ROAD USE ONLY (except the KUBERG Freerider

Street). KUBERG motorcycles cannot be used on public roads or sidewalks.

The purchaser, owner, and/or riders of this motorcycle are directly responsible for

ensuring that they obey all local, state, federal and national laws regarding the riding

and use of this motorcycle.

Weather & riding conditions

Do not ride in the rain or snow. Please be aware that distance required to stop under wet

conditions may be double or even triple the usual distance required under dry conditions.

If riding in adverse weather conditions, ride more slowly and anticipate your stops by

applying the brakes MUCH earlier. Do not allow young riders to ride on slopes that are too

steep for their ability.

Night time

Do not ride after dark or in low light conditions.

Batteries

We have equipped your KUBERG Challenger with highly advanced lithium-ion batteries.

Go to page 23 to learn about these batteries and the correct charging procedure.

Be aware of the motorcycle’s chain

Under no circumstances should hands or other body parts be close to a moving

motorcycle chain. Riders should wear motorcycle boots without laces, and should not

wear any loose clothing that could be caught by the chain.

8 CHALLENGER - OWNER‘S MANUAL 9

1Throttle

2Handlebar

3Steering column

4Front brake

5Rear brake

6ON/OFF switch

7Front fender

8Tire

9Front fork

10 Speed & torque control button

11 Foot pegs

12 Motor

13 Rear shock absorber

14 Chain tensioner

15 Charge port

16 Controller

17 Side panel/Battery cover

18 Chain guide

19 Frame protection cover

Motorcycle overview

2021 Kuberg Challenger

For teens and adults looking for serious acceleration, the powerful Challenger opens the

door to a whole new riding experience.

Speciﬁcations

Kuberg Challenger 24” | 20”

Weight 48 kg (105.7 lbs) | 42 kg (92.6 lbs)

Power 12 or 8 kW, 48 V motor

Batteries 16,8 Ah / 24 Ah extended, 48 V Lithium-Ion with BMS

Controller KUBERG BLDC PRO

Input standard 110 V or 230 V

Transmission Clutchless one speed

Final drive 70T/10T | 55T/10T, chain 219H

Frame Aluminium Hydroformed Cradle frame

Wheelbase 125 cm (49.2”) | 120 cm (47.2”)

Seat height -

Handlebar height 106 cm (41.7”) | 100 cm (39.4”)

Front and rear brakes Hydraulic Disc Brake System Tektro Orion 4P

Brake discs front / rear Hardened brake discs SBT 35 HRC

203/180 mm | 203/160

Brake pads Sintered brake pads

Front fork RST KILLAH 200 mm

Rear shock absorber DNM Burner RCP-3 200 lbs

Tires front / rear 19”×2.75” M / 16”x3.5” M | 20”x2.5“ B / 14”x3.0” M

M - motorcycle tire, B - bicycle tire

Carrying capacity Maximum 220 lbs (100 kg), 1 person only

Colors Black w/ yellow

WARNING!

The KUBERG Challenger is designed to operate at 48 volts only. Use of any battery

voltage other than 48 volts will result in motor failure. KUBERG Inc. considers

modiﬁcations and/or changes to its electrical components to be a material alteration of

its products, thereby voiding any warranties and/or guarantees in their entirety. KUBERG

Inc. will not be responsible for any injuries, and/or death and/or other damage(s) caused

by such modiﬁcations.

10 CHALLENGER - OWNER‘S MANUAL 11

14 Using the Allen wrench #3 loosen and remove 4 bolts on side panels (2 on each side)

and slide these panels up to remove them.

15 Connect two main battery connectors (red to red and black to black) and the BMS

(battery management system) cable (yellow).

16 Slide the side panels back and tighten all bolts (2 - 3 Nm).

WARNING!

Incorrect connecting of the battery wires to the motorcycle terminals may cause

irreparable damage to motorcycle electrical components.

First setup

1Check the tire pressure of both tires and conﬁrm that they are properly inﬂated.

The optimal tire pressure for the KUBERG Challenger is 35 – 50 PSI (2.4 – 3.4 bar) for

general use and should never exceed 50 PSI (3.4 bar).

2Unpack the charger from its box and charge the batteries, being sure to follow the

correct charging procedure. Go to page 26 to ﬁnd detailed charging instructions.

3Compress each brake lever. The lever should not compress completely to the

handlebar. Each individual brake should hold the motorcycle securely when you

push the motorcycle against the brake. If your brake needs adjustment, follow the

instructions on page 21. All riders should be aware which lever operates which brake.

4Check the chain for tightness and lubrication and if needed, follow the section

Adjusting chain tension on page 17.

5Set the power and torque settings to an adequate level for the rider’s experience and

riding skills. Go to page 15 to ﬁnd detailed instructions concerning how to set speed

limits and dierent riding modes.

WARNING!

There are no user serviceable elements incorporated into the motor, motor controller,

batteries, battery charger, throttle, or wiring harness of your KUBERG electric motorcycle.

DO NOT ATTEMPT TO DISASSEMBLE OR ADJUST ANY OF THESE COMPONENTS. Doing

so may cause extensive damage to these components, will void your warranty, and may

result in danger to persons and/or property. If you cannot resolve any problem using this

owner’s manual, contact your KUBERG authorized dealer, or call the KUBERG Customer

Service for assistance.

Break-in period

To assure future reliability and top-notch performance of your KUBERG Ranger, please

pay extra attention during your ﬁrst 150 km/93 miles or three full-charge cycles (whichever

comes ﬁrst). During this period please obey the following:

Avoid full-throttle starts and accelerate gradually.

Avoid full speed riding and use the Beginner and the Sport mode only. Do not use the

Race mode.

Avoid hard braking. New brakes need some time to break in with moderate use.

Before ﬁrst ride

NOTE:

If you purchased your KUBERG motorcycle at a local dealer, your motorcycle might already

be fully adjusted and ready to ride. If you purchased your KUBERG motorcycle still in the

original packaging, please carefully follow the instructions below and any supplemental

instructions in order to complete the assembly and adjustment of your KUBERG motorcycle.

Unpacking and assembly

WARNING!

Failure to properly assemble and adjust your motorcycle prior to use may result in

an accident, resulting in death, serious injury and/or damage to property. If you are

uncertain about any aspect of the assembly and adjustment of your motorcycle, seek

help from a qualiﬁed mechanic or KUBERG Customer Service.

1With the help of another person, carefully remove your KUBERG Challenger

from the box.

2Place the motorcycle on a solid and level surface onto a block or stand so that the

rear wheel is o the ground.

3Remove all the packing materials.

4Using the Allen wrench #5 remove the front side of the stem, install the handlebars

onto the stem and tighten all bolts crosswise (6 - 7 Nm).

5Using the Allen wrench #8 loosen (clockwise) and remove front axle locking bolt (right

hand side of the motorcycle).

6Using the same wrench, loosen and slowly remove the axle from the disc side and

spacers. Note the position and orientation of both spacers and that one spacer acts

also as a disc guard.

7Remove the transport insert from the front brake caliper. From this point, do not push

the front brake lever until the assembly is done completely.

8Check that the front hub spacer is coaxial with both bearings and insert the front

wheel and both spacers carefully into the front fork. The brake disc must slide easily

and gently between brake pads. Then slowly slide the axle into the front hub from the

disc side and tighten it (ﬁrst by hand clockwise, then to 12-15 Nm).

9Re-insert and tighten the axle locking bolt anticlockwise (12 - 15 Nm).

10 Ensure the wheel is aligned correctly and the axle bolt is tight.

11 Spin the front wheel to ensure it is centered and spins freely. If not,

follow the front brake adjustment on page 21.

12 Using the Allen wrench #4 adjust the brake lever positions to suit the

rider (5 - 7 Nm).

13 Make sure the ON/OFF switch is in OFF position.

12 CHALLENGER - OWNER‘S MANUAL 13

Motorcycle controls

Magnetic Kill Switch

The magnetic kill switch is located on the left hand side of the handlebars. Always switch

the motorcycle into the OFF position when stopped or parked.

WARNING!

If the power is turned ON and the throttle is open, the motorcycle will accelerate

immediately. This is potentially very dangerous. The rider’s right hand should be used to

switch the power on, with no hands on the throttle.

Speed & torque control button

The speed & torque control button allows a responsible adult to set motorcycle

maximum power and torque. There are three distinct power & torque modes.

Go to page 15 to read detailed instructions concerning how to set the various power &

torque modes. Do not attempt to guess or assume these settings. Always check them

before allowing the rider back on the motorcycle.

Charging port

When it’s time to recharge the motorcycle, the battery charger connector attaches to

this port. Before attaching, ensure that the power is switched to the OFF position. Please

refer to the battery and charging section (page 25) of this manual for more information.

WARNING!

The power on the motorcycle must be switched OFF before attaching and plugging in

the charger.

Charge indicator

The LED battery charge indicator is located on the right side of the fork upper plate.

The LED illuminates green when the motorcycle is fully charged, yellow when the charge

reaches 65% and red when the battery charge reaches 30%. The red light will start

blinking when the battery charge is very low. From this point. the motorcycle will start

losing power and will be able to travel roughly 2 - 3 km (1 - 2 miles) before the motorcycle

shuts down completely.

Setting up your Kuberg

Challenger for riding

WARNING!

Improper set-up is dangerous! It is your responsibility to set the motorcycle to the

ability of the rider. Failure to do so, may result in injury or death, and/or damage to your

motorcycle.

NOTE:

A responsible adult must ensure that the KUBERG Challenger and its rider are prepared

for every ride. The motorcycle must be set to the abilities of the rider, and the rider and

the motorcycle must be supervised when ridden by a teenager. Novice riders can lose

concentration quickly, and be easily distracted. If the power is set too high, an accident

could occur. RIDE SAFE!

Setting power & torque modes

Follow these steps to limit the maximum power and torque on your KUBERG Challenger:

1Turn OFF your motorcycle.

2Press and hold the map button. The map button is located on the right side of the

handlebars.

3Turn ON your motorcycle.

4The motorcycle will beep one, two or three times to indicate the desired power mode

1 beep - Beginner Mode (low-power)

2 beeps - Sport Mode (medium-power)

3 beeps - Race Mode (maximum-power)

14 CHALLENGER - OWNER‘S MANUAL 15

For example, if you want the medium power mode, hold the control button for two

beeps and release. The motorcycle will conﬁrm your selection with a double beep.

5The power mode is now set. If you want to set a dierent power mode level, repeat

the process from step 1.

CAUTION!

Sport and Race modes should only be used by experienced riders!

Drivetrain

Your KUBERG Challenger features a traditional chain and sprockets. It has a direct drive

with no gears. The chain does not need to be adjusted on a regular basis, especially

when the motorcycle is new.

However, it is important to check the chain before every ride and adjust it when

necessary. There should be only a very little slack in the chain.

Adjusting chain tension

Follow these steps to adjust the chain tension:

1Ensure the power is turned OFF.

2Lift the motorcycle onto a block or stand so that both wheels are o the ground.

3Using the Allen wrench #10 and the open wrench #24 loosen the rear axle nut.

4Turn the adjustment eccentres evenly on both sides. Very small movements make a

big dierence. Do not tighten the chain too much so that there is no slack at all. It

should be ‘taught’, not ‘tight’.

5Tighten the rear axle nut (78 - 80 Nm), check the sprocket and chain tensioner for

tightness and ensure all bolts are tight.

6When turning the rear wheel by hand, lubricate the chain with the o-road

motorcycle chain lube spray.

7Spin the rear wheel by hand at least 10 times more around and wait a few minutes for

a spray to dry o.

8Remove the excess lubricant using a cloth. If the wheel does not spin freely, go to

page 21 and follow the brake adjustment instructions.

9Check once more the rear wheel for alignment and the chain for tension.

WARNING!

Failure to maintain and adjust the chain and align the wheel correctly could result in

the chain jumping o the sprockets, causing a potentially dangerous and damaging

situation.

Motor performance

The KUBERG Challenger has multiple sensors and control software to prevent the

batteries, the motor and the controller from overheating. Once the temperature of

batteries, motor or controller reaches a high temperature, the motorcycle power will be

16 CHALLENGER - OWNER‘S MANUAL 17

Maintenance

KUBERG motorcycles generally require signiﬁcantly less maintenance compared to

traditional gas motorcycles due to having very few moving parts, no gas engine and no

exhaust. Our authorized dealers have extensive experience and know KUBERG vehicles

inside and out, so they can provide high-quality service for your KUBERG motorcycle.

However, service at a dealer is not required to maintain your warranty.

WARNING! PROPER MAINTENANCE OF THIS VEHICLE IS REQUIRED

Failure to maintain this vehicle in proper operating condition may lead to an accident

resulting in death or serious injury, and/or damage to property. If you have any questions

about the proper care and maintenance of this vehicle, consult your selling dealer/

distributor or contact KUBERG Customer Service (kuberg@kuberg.com,

+420 608 757 353.

limited to 70% until the components are able to cool down. If the motorcycle continues to

overheat, the controller will shut o the motorcycle until the components have cooled. This

takes approximately 15 to 30 minutes.

Thermal shutdown of the motor can occur when riding in situations that stress the motor

for a long period of time, such as long up-hills or continuous full throttle operation with no

rest period for the motor or dirt on the motor cooling ribs. For the best riding experience

keep your motorcycle clean.

Weather eects on performance

Very cold weather (-10°C / 14°F and lower) is hard on the motorcycle’s batteries and, as a

result, the battery charge will not last as long as at temperatures around 20°C / 68°F. This

is normal and does not require maintenance or servicing.

18 CHALLENGER - OWNER‘S MANUAL 19

Before each ride

1Make sure that all bolts and nuts are fastened securely and that the tires

are properly inﬂated.

2Check that the throttle and brake controls are operating freely.

3Check the chain and if needed, go to page 17 and follow these steps to adjust its

tension.

4Lubricate the chain with the dry motorcycle chain lube spray, spin the rear wheel by

hand at least 10 times around and remove the excess lubricant using a cloth. If the

wheel does not spin freely, go to page 21 and follow the brake adjustment instructions.

This vehicle should be returned for periodic maintenance to your selling dealer AT

LEAST once per year, but more frequently if used under severe or heavy use conditions.

The service log is located at the end of this manual and required when servicing the

motorcycle.

Keep your KUBERG Challenger clean and dry. Regularly check all components for tightness

and adjustment, including handlebars, levers, axles, chain and brakes. Check the settings

for torque and maximum speed. Check the tires for damage and for proper inﬂation.

Cleaning

Cleaning and maintaining your Challenger

correctly will provide more enjoyable ownership

and riding experience. By hand cleaning the

motorcycle, you can simultaneously inspect

all of the components. While the motorcycle

components are waterproof, be careful when

washing the motorcycle around the electrical

components, especially the charge port,

controller, battery, motor and a throttle. Do

not disassemble the motorcycle in any way before washing. You are free to wash your

Challenger with a low pressure water hose with clean water.

After cleaning:

1Lubricate the front fork gliders with an appropriate amount of specialized fork

lubricant spray and remove the excess lubricant using a cloth.

2Lubricate the chain with the o road motorcycle chain lube spray, spin the rear wheel

by hand at least 10 times around and wait a few minutes for a spray to dry o.

3Remove the excess lubricant from both chains using a cloth.

WARNING!

Do not disassemble the motorcycle in any way before washing. Using a power wash is NOT

ALLOWED! Do not use cleaners with added salt as it often consists of a lot of phosphates

that can harm the paint and the electronics. Do not use engine cleaners or solvents.

Rear wheel removal and installation

1Make sure the power is switched OFF.

2Lift the motorcycle onto a block or stand so that both wheels are o the ground.

3Using the Allen wrench #5 loosen and remove 2 upper bolts from the chain guide and

remove it from the rear swing arm.

4Using the Allen wrench #10 and the open wrench #24 loosen and remove the rear

axle nut. Don’t remove the rear axle yet.

5Move the rear axle and both chain eccentres a few millimeters aside to the point

where the wheel can be pushed forward and the chain can slip o to the outer side

of the sprocket.

6While holding the wheel, slowly remove the rear axle and spacers on both sides.

7Pull the wheel carefully back to remove it.

8To re-install the wheel, reverse the above procedure and ensure the wheel is aligned

correctly and the axle nut is tightened properly. (78 - 80 Nm).

9Spin the rear wheel to ensure it is centered and spins freely. If not, go to the bottom

of this page and follow the brake adjustment instructions.

Front and rear brake adjustment

1Check whether the brake disk and the brake pads are not worn-out and don’t need

a replacement.

2Using the Allen wrench #5, loosen the two brake caliper bolts.

3Pull and hold the corresponding brake lever ﬁrmly for the caliper to get centered with

the brake disc and re-tighten the caliper ﬁxing bolts (9,5 - 10,5 Nm), then release the

brake lever.

4Test the brake by pulling hard on the lever a number of times.

5If the wheel does not spin freely with the brake lever released, the caliper position

itself needs to be ﬁne adjusted again repeating the steps 1 to 3. Remember that the

new brake pads are thicker and need to break-in ﬁrst.

WARNING!

Do not operate your KUBERG Challenger if any damage is apparent. Immediately contact

your local retailer/distributor or KUBERG Customer Service.

WARNING!

There are no user serviceable elements incorporated into the motor, motor controller,

batteries, battery charger, throttle or wiring harness of your KUBERG electric motorcycle.

DO NOT ATTEMPT TO DISASSEMBLE OR ADJUST ANY OF THESE COMPONENTS.

Doing so may cause extensive damage to these components, will void your warranty,

and may result in danger to persons and/or property. If you cannot resolve any problem

using this owner’s manual, contact your KUBERG authorized dealer, or call the KUBERG

Customer Service for assistance.

Front wheel removal and installation

1Make sure the power is switched OFF.

2Lift the motorcycle onto a block or stand so that both wheels are o the ground.

3Using the Allen wrench #8 loosen (clockwise) and remove front axle locking bolt (right

hand side of the motorcycle).

4Using the same wrench loosen and while holding the wheel, slowly remove the axle

from the dics side and spacers. Note the position and orientation of both spacers

and that one spacer acts also as a disc guard.

5Lower the wheel carefully away from the front fork.

6To reinstall the wheel, check that the front hub spacer is coaxial with both bearings

and insert the front wheel and both spacers carefully into the front fork. The brake

disc must slide easily and gently between brake pads. Then slowly slide the axle into

the front hub from the disc side and tighten it (ﬁrst by hand clockwise, then to 12-15

Nm).

7Reinsert and tighten the axle locking bolt anticlockwise (12 - 15 Nm).

8Ensure the wheel is aligned correctly and the axle bolt is tight.

9Spin the front wheel to ensure it is centered and spins freely. If not, follow the front

brake adjustment on page 21.

20 CHALLENGER - OWNER‘S MANUAL 21

Brake squeal

Dirt and humidity can cause noisy or squealing brakes. These are normally temporary and

should gradually disappear with regular use. Repair is not required. If you hear a metallic

“screeching” sound, you might need to replace the brake pads. Visit your KUBERG dealer to

replace the brake pads.

Adjusting the suspension

The KUBERG Challenger features both front and rear suspension.

Front suspension

The front suspension on your KUBERG Challenger is adjustable, the RST KILLAH front

fork has settings for damping.

RST KILLAH quick set-up guide

1Rotate the blue adjuster, located on the fork upper plate, to change the amount

of compression damping to the lockout.

2Rotate the red rebound adjuster, located on the bottom of the right fork, as

indicated on the sticker, to adjust the rebound to faster or slower.

Rear suspension

Your KUBERG Challenger is equipped with a single coil spring and a DNM Burner RCP-3

shock. For a harder/stier ride at the rear, tighten the adjustment ring in a clockwise

direction. For a softer ride, loosen the adjuster by turning anti-clockwise.

22 CHALLENGER - OWNER‘S MANUAL 23

Battery use, care

and maintenance

For the proper use, maintenance and storage of the battery, it is critically important that

you follow and understand the instructions in this manual.

If you have any questions about the battery or its usage, please do not hesitate to

contact the KUBERG Customer Service Department.

WARNING!

Failure to properly use, charge and store this battery will void the warranty and may

cause danger or damage. DO NOT use this battery with any other vehicle or appliance.

Use of this battery with any other product will void the warranty and may create

a hazardous situation that may cause a ﬁre resulting in severe injury or death, and/or

damage to property.

NOTE: The battery has an advanced battery management system (BMS) watching

over cell-voltages, currents, temperatures etc. If any error on the battery module occurs,

the BMS will keep the motorcycle safe. However, you must always park your KUBERG

Challenger away from any ﬂammable objects

CAUTION!

Minimum distance between the parked vehicle and any ﬂammable object must be at

least 3 meters (10ft.)

WARNING! NEVER SHORT CIRCUIT THE DISCHARGE TERMINALS OF THE BATTERY.

A short circuit will damage the battery and may cause a ﬁre resulting in severe injury or

death, and/or damage to property.

WARNING!

Never mechanically manipulate the battery, never open the battery pack and do not

puncture the battery cover or the battery itself.

CAUTION!

Keep the battery away from excessive heat and/or open ﬂames. Avoid long term

exposure to direct rays from the sun.

CAUTION!

Protect the battery from water or other moisture. If the battery becomes wet from rain

during use, dry as soon as possible. Remove the battery from the motorcycle before

washing.

CAUTION!

To avoid damage to the battery, never expose it to intense physical shock or severe

vibration.

Charging instructions - Kuberg Challenger

Always follow these steps when charging your KUBERG Challenger:

1Make sure your KUBERG Challenger is turned OFF.

2Connect your charger to an electrical outlet (AC) 110 V or 230 V.

3Turn on the power switch on the charger.

4Wait for 30 seconds.

5Connect the charger cable to the battery connector on your motorcycle.

CAUTION!

If the charger is plugged into the motorcycle with the charger switched OFF, a potential

in-rush of electrical current from the motorcycle battery to the charger may damage the

charger.

The recommended charging time for a fully discharged battery is 1.5 hours, respectively

3 hours for the bigger 24 Ah battery pack.

After 1.25 hours of charging, respectively 2.5 hours of charging the battery should be

charged to about 80 %

24 CHALLENGER - OWNER‘S MANUAL 25

WARNING!

Only use the supplied battery charger. Using any other battery charger will void the

warranty and may damage the battery.

The LED light on the charger will illuminate RED while charging.

The LED light on the charger will illuminate GREEN when the battery is fully charged.

CAUTION!

The battery charger supplied with your KUBERG Challenger is for INDOOR use only.

Important notes about battery charging

WARNING!

Do not cover the charger or its fan while charging, this can cause the charger to

overheat and may damage the charger and/or the motorcycle electrical components.

Avoid any contact with water or other ﬂuids while charging the battery. If the battery,

charger or any connections become wet, immediately unplug the charger and

thoroughly dry all components.

Only charge under the constant supervision of an adult. Children must not operate

the charger.

Keep the charger and the motorcycle at least 3 m (10 ft) away from ﬂammable items and

direct sunlight during charging.

Never dismantle or disassemble the supplied charger. Never use the supplied charger

for any purpose other than charging a KUBERG Challenger motorcycle.

Battery removal and installation

During normal use, KUBERG does not recommend removing the batteries from the

KUBERG Challenger. If you need to replace the battery or remove it, KUBERG highly

recommends taking the motorcycle to a certiﬁed technician or a KUBERG dealer.

If you choose to remove or replace the battery yourself, please follow the following

instructions carefully:

1Ensure the power switch is in OFF position.

2Stabilize the motorcycle using an additional stand on the rear wheel (sold separately).

3Using the Allen wrench #3 loosen and remove 2 bolts on the right side panel and

gently slide this panel up to remove it.

4Unplug the battery connectors, one at a time. Note the direction and position of the

battery and the terminal for each wire. When it comes time to reconnect, each wire

must be connected to the correct terminal.

5With the Allen wrench #5 loosen and remove 1 remaining bolt holding the battery in

the frame.

6Push the remaining positive and negative wires to the front and sides of the

motorcycle, so the battery pack can be carefully pulled out.

7With the help of other person gently remove the battery out from the frame. Be extra

careful to the wires and connectors.

8To install the battery, reverse the procedure above and ensure all connectors are

secured and all bolts are tightened properly. Tightening torque for the battery bolt

(removed during step 6) is 9,5 - 10,5 Nm, for side panel bolts use 2 - 3 Nm.

WARNING!

Incorrect connecting the battery wires to motorcycle terminals may cause irreparable

damage to motorcycle electrical components.

Short term and long term storage

If you do not plan to use your Challenger for an extended period of time (2 weeks or more),

disconnect the battery from the controller, also disconnect it from the charger and keep

your battery pack at 50 - 60% of its capacity (48,3 - 49,6 Volts). Store the motorcycle in

a dry and cool place at temperatures between 5 - 15°C (41 - 59°F). The battery MUST

be stored in a place that is NOT warm. It is not advised to place the battery in a freezer,

since the battery voltage would sag badly. If you decide to remove the battery and store

it in a cooling box, please wait until the battery warms to room temperature prior to the

reinstallation of the battery back into the motorcycle.

WARNING!

Our motorcycles can be stored indoors only if the battery is physically disconnected.

Keep the motorcycle and the battery away from excessive heat and/or open ﬂames.

Avoid long term exposure to direct rays from the sun.

Keep the charger, the battery and the motorcycle at least 3 m (10 ft) away from

ﬂammable items and direct sunlight during charging and/or storage.

If you have any questions about the batteries or their usage, please do not hesitate to

contact the KUBERG Customer Service (kuberg@kuberg.com).

Battery disposal

We are conﬁdent that you will enjoy many kilometers or miles of thrilling riding with your

KUBERG motorcycle. But, batteries can eventually wear out. When this happens, we urge

you to properly dispose of your used batteries. For guidance regarding proper disposal

of your batteries, please contact the KUBERG Customer Service (kuberg@kuberg.com).

Also, you can ﬁnd useful information regarding used battery drop-o sites from the

Rechargeable Battery Recycling Corporation (RBRC) at www.rbrc.org.

26 CHALLENGER - OWNER‘S MANUAL 27

Riding instructions & safety

tips (novice riders)

With the motorcycle set up correctly, your KUBERG Challenger is ready to ride! For novice

riders, please follow these tips and instructions. The riders will get the most enjoyment if

they feel safe and in control. Do not be tempted to start the rides too quickly. Make sure

the speed and power settings are set slow to begin with. For the ﬁrst time riders, this

should be near the walking pace.

First ride (novice riders)

Stand astride the motorcycle and locate the controls while the motorcycle is switched OFF.

After you understand the controls and are comfortable with them, it’s time for the ﬁrst ride.

For this, make sure you are dressed correctly in suitable safety gear. Boots, gloves, helmet

and eye protection are necessary. The area for riding must be ﬂat, open and safe, with no

obstacles of any kind. The motorcycle must be set up correctly, with the speed and torque

tuned to a slow setting.

1Ensure the power is turned OFF.

2Stand astride the motorcycle, keep your feet on the ground and move the motorcycle

from side to side, forward and back, to get comfortable with the handlebar position

and weight distribution.

3Switch the motorcycle ON by switching the power switch to the ON position (magnetic

kill switch).

4Before twisting the throttle, you should have one foot on the ground and the other one

on the corresponding foot peg.

5Twist the throttle smoothly and slowly and set o.

6Once comfortable, lift both your feet onto the foot pegs as you ride.

7Once stopped, set the power switch to the OFF position by unplugging the magnetic

kill switch.

Learning to stand up

Once the basics are mastered, the speed and torque settings can be switched to faster

and more powerful settings, step by step, to match the improving skills of the rider. Before

you get going too quickly, it’s a good idea to learn to ride the motorcycle ‘correctly’. This

means changing the riding position and in control. Learning to change the riding position

is dicult if a rider does not have good throttle control. While the speed setting is set to

low, the rider must learn to rotate his/her wrist ‘around’ the throttle so that when he/she

moves forward or backwards, the wrist is in the correct position. As the power and torque

settings get higher, the ‘dead-zone’ in the throttle diminishes, so it becomes easier to

stand up and work the throttle.

Correct riding technique

Learning the correct riding techniques will prepare the rider for all forms of riding that

come later. The rider needs to learn to control the motorcycle at slow speeds and use the

correct technique to execute tight turns. The natural approach of many riders is to turn the

handlebars but this is not a correct riding technique. The correct technique is to lean and

use so-called counter-steering.

Counter-steering is turning the handlebars in the opposite direction as the rear wheel

intends to travel outwards of the corner (over-steering). This will cause the motorcycle to

lean and turn in the desired direction. Counter-steering needs to be taught slowly and

smoothly, sudden movements of the handlebars may cause an accident. If tight turns are

mastered correctly, many other skills will follow naturally.

28 CHALLENGER - OWNER‘S MANUAL 29

Protective equipment

Always follow these instructions for protective equipment for every ride in order to limit

the risk of injury in case of an accident. The KUBERG Challenger is intended for OFF

ROAD use and therefore there is a high likelihood of dirt and other debris being thrown

into the air, which presents a risk of injury. Also, there is a high possibility of an accident

or a fall.

The rider should use and wear:

1A high quality helmet approved by your country’s governing body

2A helmet face-shield or goggles

3Protective clothing that covers rider’s legs, ankles, torso and arms

4Wrist, knee and elbow protection

5Solid motorcycle boots

6Gloves made from tear resistant materials (leather or kevlar)

7Motorcycle jacket made from tear resistant materials (leather or kevlar)

8Clothing that is brightly colored so other vehicle users and pedestrians can see you

WARNING!

THE RIDER MUST WEAR PROTECTIVE EQUIPMENT, ESPECIALLY HELMET, BOOTS AND

EYE PROTECTION.

Helmets

There is no single factor that works best for reducing the severity of injuries sustained in

accidents more than a quality helmet. Don’t ever allow your KUBERG motorcycle to be

ridden without a helmet.

Clothing

Motorcycle leathers and padded protection for knees, back and arms can prevent

abrasion injuries in the event of a fall. Failure to use appropriate safety equipment greatly

increases the likelihood of death or serious injury in the event of an accident.

Never wear loose-ﬁtting clothes as these may catch on wheels, chains, control levers or

footrests.

Do not wear shoes or boots with laces as these can get caught in motorcycle’s chain or

wheels and result in serious injury.

Accessories

Adding accessories or cargo to your KUBERG motorcycle can negatively aect its

stability and handling. To avoid the risk of an accident, use extreme caution when

adding accessories or cargo to your KUBERG motorcycle. Use additional care when

riding with added accessories or cargo.

CAUTION!

The total weight of the rider, accessories and cargo must not exceed the maximum load

limit 100 kg (220 lbs).

WARNING!

Never attach any large or heavy items to the handlebar, front fork, or front fender.

Genuine KUBERG accessories have been speciﬁcally designed for use on this

motorcycle. Since KUBERG cannot test all other accessories that may be available, you

are personally responsible for the proper selection, installation and use of non-KUBERG

accessories. Use extreme caution when selecting and installing any accessories.

30 CHALLENGER - OWNER‘S MANUAL 31

Limited warranty

Kuberg motorcycles are warranted to the original retail purchaser to be free from defects in materials and

workmanship in the frame and components except for batteries, tires, and inner tubes for a period of thirty (30)

days from the date of purchase. An upgrade to a three (3) month Limited Warranty is available to the original retail

purchaser who registers his/her motorcycle via the registration form on www.kuberg.com/bike-registration within thirty

(30) days from the date of purchase. A further optional Extended Warranty is available for a fee.

Warranty is valid for 3 months from the purchase date of the motorcycle via a Kuberg dealership. Warranty is non-

transferable. All warranties are voided upon secondhand resales.

Batteries are warranted to the original retail purchaser to be free from defects in materials and workmanship for

the ﬁrst 300 charging cycles where they have to keep more than 80% of their initial capacity, provided charging,

maintenance and storage instructions are properly followed.

Tires and tubes are warranted to be free of manufacturing and material defects for thirty (30) days. Such tire and

tube warranty shall not include ﬂat tires, tire cuts, skid through, over-inﬂation blowouts, or other such misuse or normal

hazards.

Warranties are limited to repair and/or replacement of motorcycle and/or parts found by Kuberg to be defective, at

the sole discretion of Kuberg. Kuberg Limited/Extended Warranty does not cover or apply to the following:

- normal wear and tear

- damage, failure and/or loss caused by accident, shipping, misuse, or neglect

- damage due to improper transportation

- exceeding the weight limit of the vehicle

- use by the operator not speciﬁed in the age range vehicle was designed for

- abuse and/or failure to follow instructions or warnings as stated in the applicable owner’s manual or other printed

materials provided with the product

- damage, failure and/or loss caused by the use of the product for stunt riding, ramp jumping, speed competition,

inappropriate o-road use, acrobatics, trick riding or other similar activities, or in any other manner for which such

products were not speciﬁcally designed

This warranty does not apply to any products or components, mechanical and/or electrical, which have in any way

been altered from their original conﬁguration by any person. Kuberg will not be liable and/or responsible for any

damage, failure or loss caused by any unauthorized service or use of unauthorized parts. Warranties do not cover

or apply to any Kuberg product used for rental or commercial purposes unless the speciﬁc product is designated,

labeled, or marketed by Kuberg as acceptable for rental or commercial use.

All warranty claims must be made directly to the original selling retailer. The selling retailer is the primary provider of

warranty support and customer service. Kuberg may choose to perform warranty service at the sole discretion of

Kuberg. The original owner of the product must provide proof of purchase prior to the approval of any warranty claim.

Under no circumstances do our warranties include any costs associated with the shipment and/or transportation to or

from retailer, distributor or Kuberg. Kuberg, at its sole discretion, has the option of replacing with a new part, a factory

recertiﬁed part, or repairing any defective product and/or component thereof, or to pay to the owner of such product

an amount equal to the original purchase price of such product.

The original owner shall pay for all costs of labor associated with any warranty claims. This warranty supersedes all

previous warranties. The warranties stated herein are in lieu of and expressly exclude all other warranties not expressly

set forth herein, whether expressed or implied by law or otherwise, including, but not limited to, any warranties for

merchantability and/or ﬁtness for any particular purpose. Kuberg shall in no event be liable or responsible for incidental

or consequential losses, damages or expenses in connection with their electric dirt motorcycle products. The liability of

Kuberg hereunder is expressly limited to the replacement of goods complying with this warranty or at the sole election

of Kuberg to the repayment of an amount equivalent to the purchase price of the product in question. CAUTION!

Some states may not permit the exclusion or limitation of consequential damages and therefore, such limitations may

not apply to the consumer in which such impermissible exclusions are involved.

The Customer’s Responsibility under the warranty shall be to:

- Operate and maintain the motorcycle as speciﬁed in the appropriate Owner’s Manual

- Give notice to an authorized Kuberg dealer of any and all apparent defects within ten (10) days after discovery, and

make the machine available at the time for inspection and repairs at the dealer’s place of business.

Contact information on the back of this manual.

32 CHALLENGER - OWNER‘S MANUAL 33

Kuberg Motorcycle Service Log

Kuberg motorcycles are designed for extreme riding conditions which can cause a lot of stress

to the bike’s components. Because of this, Kuberg warranties require scheduled maintenance

at 3, 6, and 12 months in order to maintain optimal performance.

Please keep this service log in your records to present to your dealer at each service visit.

3RD MONTH

DATE DEALER