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: [e-mail], phone:
[phone])
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.
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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 ([e-mail],
[phone].
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.