Cobra CX50 JR 2015 User manual

DISCLAIMER OF WARRANTY
This motorcycle is sold “as is” with all faults, obvious or not. There are no warranties
expressed or implied, including any warranty of merchantability and warranty of fitness
for any particular purpose.
WARNING
THE COBRA CX50JR IS A COMPETITION MODEL ONLY AND IS NOT
MANUFACTURED FOR, NOR SHOULD IT BE USED ON PUBLIC STREETS, ROADS
OR HIGHWAYS.
THE USE OF THIS BIKE SHOULD BE LIMITED TO PARTICIPATION IN
SANCTIONED COMPETITION EVENTS UPON A CLOSED COURSE BY A
SUFFICIENTLY SKILLED RIDER AND SHOULD NOT BE USED FOR GENERAL
OFF-ROAD RECREATIONAL RIDING.
IMPROPER USE OF THIS MOTORCYCLE CAN CAUSE INJURY OR DEATH.
THIS BIKE IS INTENDED FOR EXPERIENCED RACERS ONLY AND NOT FOR
BEGINNERS.
IT IS YOUR RESPONSIBILITY AS THE OWNER OF THIS COBRA MOTORCYCLE
OR AS THE PARENT, OR LEGAL GUARDIAN OF THE OPERATOR, TO KEEP THIS
COBRA MOTORCYCLE IN PROPER OPERATING CONDITION.
THIS BIKE WAS DESIGNED FOR RIDERS THAT WEIGH LESS THAN 80 LBS WITH
FULL RIDING GEAR AND SHOULD NOT BE OPERATED BY RIDERS THAT WEIGH
MORE.
BE SURE THAT THE RIDER ALWAYS WEARS ADE UATE SAFETY GEAR
EVERYTIME HE OR SHE RIDES THEIR COBRA MOTORCYCLE.
IMPORTANT SAFETY NOTICE
Failure to follow WARNING instructions could result in severe in ury or death to
the machine operator, a bystander, or a person inspecting or repairing the
machine.
CAUTION:
A CAUTION indicates special precautions that must be taken to avoid damage to
the machine.
NOTE: A NOTE provides key information to make procedures easier or clearer.
MCCJ2015.0

2
Table of Contents
General Information ........................................................................................................ 4
Specifications - General .............................................................................................. 4
Optional Suspension Components.............................................................................. 5
Specifications - Torque Values ................................................................................... 5
Break-In Procedure .................................................................................................... 6
Starting Procedure ...................................................................................................... 7
Maintenance ................................................................................................................... 8
Tips ............................................................................................................................ 8
Schedule .................................................................................................................... 9
Replacing Transmission / Clutch Lubricant ............................................................... 10
Proper Chain ad ustment .......................................................................................... 11
Rear Brake Maintenance .......................................................................................... 11
Brake Bleeding Procedure ........................................................................................ 13
Air Filter Cleaning ..................................................................................................... 14
Fork Maintenance ..................................................................................................... 15
Fork Air Bleeding .................................................................................................. 15
Fork Oil Replacement ........................................................................................... 15
Cobra Frictional Drive (V3 CFD) ............................................................................... 16
Parts ............................................................................................................................. 18
Parts – Airbox and Inlet System ................................................................................ 18
Parts – Bars and Controls ......................................................................................... 19
Parts - Carburetor ..................................................................................................... 20
Parts – Coolant System ............................................................................................ 21
Parts – Electrical System .......................................................................................... 22
Parts – Engine – Bottom End and Transmission ....................................................... 23
Parts – Engine Clutch and Kick Lever ....................................................................... 24
Parts – Engine – Water Pump .................................................................................. 26
Parts – Engine – Top End ......................................................................................... 27
Parts – Exhaust System ........................................................................................... 28
Parts – Forks & Triple Clamps .................................................................................. 29
Parts – Forks – Leg Assembly – Brake Side ............................................................ 30
Parts – Forks – Leg Assembly – Non-Brake Side ..................................................... 32
Parts – Frame – Mounting Hardware I ...................................................................... 34
Parts – Frame – Mounting Hardware II ..................................................................... 35
Parts – Front Brakes ................................................................................................. 36
Parts – Front Wheel .................................................................................................. 37

3
Parts – Plastic & Seat ............................................................................................... 38
Parts – Rear Brake ................................................................................................... 39
Parts – Rear Wheel .................................................................................................. 40
Parts – Shock ........................................................................................................... 41
Parts – Shock - Inside ............................................................................................... 42
Parts – Swingarm Assembly ..................................................................................... 43
Service ......................................................................................................................... 44
Engine Service ......................................................................................................... 44
Base Gasket Selection .......................................................................................... 45
Engine Removal ................................................................................................... 47
Complete Engine Disassembly Procedure ............................................................ 47
Top End Disassembly Procedure .......................................................................... 48
Splitting the Cases ................................................................................................ 49
Engine Assembly .................................................................................................. 49
Clutch ....................................................................................................................... 51
CLUTCH ASSEMBLY: .......................................................................................... 55
Ignition ...................................................................................................................... 56
Cooling System ........................................................................................................ 57
Radiator fluid removal: .......................................................................................... 57
Fuel & Air System ..................................................................................................... 60
Carburetor ............................................................................................................ 60
Reeds ................................................................................................................... 62
Exhaust .................................................................................................................... 62
Rear wheel pullers ................................................................................................ 63
Brakes ...................................................................................................................... 63
Rear Shock ............................................................................................................... 65
Tuning .......................................................................................................................... 66
Suspension ............................................................................................................... 70
Ad ustment ............................................................................................................ 70
Front Fork Operation ............................................................................................. 71
Fork Damping Ad ustments ................................................................................... 71
Rear Shock Ad ustments ...................................................................................... 72
Carburetion ............................................................................................................... 73
Troubleshooting ............................................................................................................ 76
Index ............................................................................................................................ 78

General Information
Specifications
Items
Dimensions
Wheelbase
Wheel size
Seat height
Engine
Type
Cooling system
Coolant
Displacement
Bore and stroke
Ignition system
Spark plug
Gap
Ignition timing
Fuel type
Premix Oil type
Premix oil ratio after break
Carburetion
Slow (Pilot) Jet / Main Jet
Float Height
Transmission
Speed / Clutch
Final drive ratio
Chain
Transmission / clutch oil type
Quantity
Chassis
Front tire
Pressure
Rear tire
Pressure
Front fork
Fork oil type
Fork oil amount
Std settings
Rear Shock ( std settings)
4
General Information
- General
CX50 JR
35.75” (908mm)
10” (254mm)
23.9” (607 mm)
2-stroke, single cylinder, reed valve
Liquid-cooled
50/50 antifreeze-
coolant / distilled water
49.8 cc
39 mm x 41.7 mm
Electronic, analogic advance
Autolite - XS61 & 4261
0.023” – 0.025” (0.58 – 0.64 mm)
0.040” (1.0 mm) Before Top Dead Center (BTDC)
High octane pump gasoline
Bel-Ray 1-R
Premix oil ratio after break
-in 40:1 to 50:1
14 mm Dell’Orto
Slow (Pilot) Jet / Main Jet
55 / 92
16mm + 0.5mm (0.63” + 0.020”)
Single / Cobra 3 shoe
14/37 T
420
Transmission / clutch oil type
Cobra Venom 3 Shoe Clutch Milk
235 – 350 ml (8 – 12oz)
2.50 – 10
15 psi minimum
2.75 – 10
15 psi min.
(20 psi for hard pack or rocky conditions)
CARD 32mm USD Fully Ad ustable w/ Smart Leg
2.5wt Bel-Ray Fork Oil
145 ml
Rear Shock ( std settings)
Smart leg: 3out,Compression and
rebound 1 1/2
Compression Low 7, High 7, No Rebound Ad .
coolant / distilled water
0.040” (1.0 mm) Before Top Dead Center (BTDC)
(20 psi for hard pack or rocky conditions)
CARD 32mm USD Fully Ad ustable w/ Smart Leg
rebound 1 1/2
out
Compression Low 7, High 7, No Rebound Ad .

5
Optional Suspension Components
Weight of Rider (lb) Fork Spring Shock Spring
Less than 38 (light) KCCJ3218
(18 lb/in, 3.15 N/mm) SCMUOH04 (275 lb/in) red
38 – 45 (std) KCCJ3221
(21 lb/in, 3.70 N/mm)
SCMUOH05 (285 lb/in)
yellow
46 to 55 (stiff) KCCJ3225
(25 lb/in, 4.40 N/mm)
SCMUOH06 (295 lb/in)
white
Specifications - Torque Values
Fastener Torque Value
Size & Remarks
ft-lb in-lb Nm
Cylinder head nuts 10.3 123 14 M7 X 1.0
Crankcase bolts 8.8 105 12 M6 x 1.0
Spark plug (SP) (SP) (SP) M14 x 1.25
Stator bolts 2.1 25 2.8 M5 X 0.8**
Stator cover bolts 1.7 20 2.3 M4 X 0.75
Clutch cover bolts 5.8 70 7.9 M6 X 1.0
Clutch nut 40 480 54 10 x 1.25*
Clutch bolts 12 144 16 M6 x 1.0*
Engine mount bolts 22 265 30 M8 X 1.25
Swingarm pivot 21 250 28 M14 X 2.0
Shock bolt 35 420 47 M10 x 1.5**
Triple clamp (top) 12 144 16 M8 x 1.25
Triple clamp (bottom) 6 72 8 M6 x 1.0
Water pump impeller 3.6 44 5 M5 x 0.8*
Intake manifold bolts 4.6 55 6.2 M6 X 1.0
Ignition rotor nut 33 400 45 M10 x 1.25**
Rear sprocket bolts 16 195 22 M7 X 1.0**
Axle nuts 25 300 34 M12 X 1.25
* Apply high strength thread locking agent when installing.
**Apply medium strength thread locking agent when installing.
(SP) To apply the proper torque to the spark plug when inserting, first screw the
spark plug in until the metal gasket ring causes resistance and then turn another
¼ turn.

6
Break-In Procedure
Your Cobra CX50 JR is a close-tolerance high performance machine and break-
in time is very important for maximum life and performance. The CX50 JR can be
ridden hard after the first ½ hour break-in time.
Cobra recommends Bel-Ray 1-R premix oil with high octane
pump gas mixed at 40:1 (150 ml oil to 2 gallons of gas). Other
brands of oil should be mixed at 32:1 for break-in.
CAUTION:
Failure to use proper fuel, oil, or fuel/oil mixture may result in premature engine
wear or damage to the machine.
Adhering to the following break-in schedule will result in long lasting high
performance machine.
• Start bike on stand
• First 5 minute period, operate the bike on the stand with a combination of idle
and high RPM operation. (avoid prolonged high RPM but spin the rear
wheel good at least once or twice per minute)
• Allow bike to cool
• Ride for 15 minutes maximum (avoid prolonged high RPM operation and
avoid abusing the clutch with throttle blipping.
• Allow bike to cool and inspect bike for loose fasteners.
• Avoid prolonged operation at Wide Open Throttle for the next half hour.
• After 1 hour of operation
o Check for loose bolts and nuts.
o Clean the carburetor bowl.
o Change the transmission / clutch lubricant.
• Check CFD torque and ad ust as necessary
• After 8 hours of operation
o Change the fork oil.
o Have a Certified Cobra Mechanic or suspension specialist change the
shock oil.
• Your bike is now ready for the highest level of competition!
NOTE: During break-in the bike will likely lose some engine coolant through the
radiator overflow hose. Losing up to 4 oz (120 ml) is normal. Proper coolant level
will cover the top of the radiator cores. Removing the radiator cap and looking
inside is the only way to check the coolant level.
Never remove the radiator cap of a machine that has a warm engine. Burning
and scalding could occur.

7
Starting Procedure
Before starting the machine inspect the following:
• Tire pressure
• Chain tension
• Coolant level
• Proper wear on chain rollers and sliders
• Handlebar tightness
• Throttle assembly movement/cable ad ustment
• Air Filter
• Check for loose nuts and bolts
• Turn the fuel on by rotating the fuel petcock knob to the vertically downward
position (reserve position is horizontally forward)
NOTE: For best results from your Cobra Motorcycle use only the recommended
fuel. Testing has shown that most ‘race’ fuels actually degrade performance.
Always wear a helmet and other protective riding gear.
When your pre-ride inspection is complete the bike may be started. For a cold
engine follow this procedure.
1. Place the motorcycle on a stand of sufficient strength that positions the
motorcycle in a level upright position with the rear wheel off the ground.
2. Pull up the choke knob and turn it to lock it.
3. Kick start the engine.
4. Rev the engine in short spurts, turning the throttle no more than 1/4 open
until the engine will run without the choke.
5. Verify a functional engine shut-off switch by shutting off the engine.
6. Restart the engine and proceed with riding when the engine is sufficiently
warm (i.e. the side of the cylinder is warm to touch).
CAUTION:
Never rev an engine full throttle until the engine is at operating temperature.
This is a high performance race motorcycle. Too much application of throttle will
likely land your little racer on his or her arse. Fenders can be replaced but
bruised egos and other body parts take longer.
CAUTION:
Cobra recommends that you tell your child to take it easy the first couple of
minutes in practice until the engine comes up to full operating temperature.
CAUTION:
Make sure your riders’ foot is not resting on the foot brake while they are riding
.

8
Maintenance
A properly maintained machine is safer, faster, and more fun to ride. It is
important that you adhere to this maintenance schedule so as to promote the
longevity of your Cobra Motorcycle
Tips
1. Recommended lubricants:
a. Cobra Clutch Milk is by far the best auto clutch lubricant. It is a
full synthetic lubricant that has been specifically formulated for
Cobra’s auto clutch and has;
• Exceptional film strength over petroleum based oils or
synthetic blends.
• Extreme temperature tolerance.
• NO frictional modifiers.
• Dispersant package to keep clutch fibers in suspension so
they can be flushed out when the oil is changed.
• Extremely low viscosity for minimal drag and ‘windage’.
b. Bel-Ray 1-R oil is the recommended premix oil because:
• Its Ester base leaves a film on all parts at all times. No metal
to metal startups or corrosion potential.
• Exception film strength over petroleum based oils or other
synthetic blends.
• Easily atomizes and burns completely.
• Does not fall out of suspension from premix in cold weather.
• Produces virtually no coking deposits, leaving pistons, rings
and heads extremely clean with minimal pipe ‘spooge’.
2. Filling your transmission with more than 8.0 oz (235 cc) of lubricant will help
to transfer heat from the clutch. Filling with more than 12 oz (295 cc) will
degrade performance.
3. The cylinder base gasket has been ‘fitted’ for your engine. The code
number stamped into the engine cases will guide you to what thickness
base gasket is required during a common top end service. See the service
section of this manual to correspond a code number with a base gasket part
number.
4. Evaluate the bikes etting only after it has been warmed up to race
temperatures.
5. New chains will stretch on first use. Never install a new chain prior to a
race. Always ‘break’ them in during practice.
6. Your Cobra motorcycle has a 10 digit VIN (Vehicle Identification Number).
The first two digits indicate the model and the seventh indicates the model
year (MY). Example, CMxxxx7xxx is a 2007 MY CX50 JR.
7. Because of the amount of heat generated by the clutch and engine during
extended periods of riding, it is advisable to remove the ignition cover
afterward to allow the ignition to cool off. The heat transfers through the
cases and can damage the stator as it cools off because of lack of airflow
around the stator.

9
8. If you ever need to weld anything on the bike, disconnect the spark plug
cap, unplug the ignition, disconnect the kill switch, scrape the paint bare
near the area to be welded and put the ground clamp as close to the area
to be welded as possible.
Be sure the fuel tank and carburetor have been removed and safely located
away from the welding process.
9. The frame is 4130 Chrome Moly and it is important to weld it with the proper
rod and heat settings set as light as possible. Cobra recommends replacing
the frame with a new one if the old one becomes damaged. Use ER70S6
filler if welding on the frame.
10. If your kick-starter lever does not return properly, first try loosening the six
kick/clutch cover screws ½ turn. Hold the kick lever ½ way down while
retightening the six screws starting for the center and working out
11. Inspect CFD slip torque after the 2nd ride and then again after the 6th ride.
After this follow the recommended schedule below.
12. Check proper clutch engagement before and after each ride. If the clutch is
engaging properly DO NOT feel the need to take the clutch apart to;
measure the spring stack, clean the stack, replace the springs, etc... Cobra
has worked very hard to make a clutch that is low maintenance and so only
take it apart if it NEEDS to be maintained.
Schedule
• Prior to each ride
o Check that the air filter is cleaned and oiled.
o Insure the smooth operation of the throttle cable(throttle soundly ‘clacks’
shut).
o Check for frayed strands of the throttle cable inside the throttle housing.
o Check for adequate tire pressure.
o Check all nuts and bolts for proper torque.
o Spray all moving parts with WD40 or other light oil.
o Check drive chain for
 Proper tension.
 Adequate lubrication.
o Insure that the ignition stator and rotor are clean and dry.
o Check the frame for cracks in the metal or cracks in the paint that might
Indicate that the metal has been stressed beyond its safe limits.
o Check the rims for signs of stress, like cracks around the rim, spokes
and hub.
o Equalize the pressure in the forks with atmosphere.
• Every 2 hours of operation
o Replace the transmission oil.
o Check the CFD torque
• Every 10 hours of operation
o Replace the fork oil.
o Have the shock oil replaced by a Certified Cobra Mechanic.

10
Replacing Transmission / Clutch Lubricant
Tools needed:
• 5mm allen wrench
• Minimum of 235 ml (8 oz) Cobra Venom 3 Shoe Clutch Milk (Part
#MCMUGF32).
Procedure:
1. Begin this procedure with a bike that has been ridden more than 5 minutes
but less than 10 minutes. It is desired to have the engine warm enough so
that the oil is ‘runny’ but not so hot that there is risk of being burned by the
engine or the oil.
Hot oil and hot components on the motorcycle may cause burns.
2. Remove the oil drain plug, on the clutch cover, near the brake lever (figure 1).
Figure 1
3. Allow the oil to drain completely, then reinstall the oil drain plug.
4. Remove the oil fill plug and add 8.0oz of Cobra Venom 3 Shoe Clutch Milk
thru the oil fill plug.
NOTE: Putting additional oil, up to 350 ml (12 oz), can help clutch life. More than
350 ml (12 oz) will degrade engine performance.
NOTE: It can be helpful to lean the bike over on its left side to add oil to the bike.
5. Reinstall the oil fill plug.
NOTE: Cobra has spent considerable time and money developing the proper
lubrication to handle the harsh environment of the automatic clutch and
transmission of this motorcycle. Cobra’s specially developed Cobra Venom 3
Shoe Clutch Milk
(Part # MCMUGF32) was formulated to provide superior
lubrication and cooling capability over extended periods of time and is the
recommended lubricant for your Cobra motorcycle.

11
Proper Chain adjustment
Tools required for chain adjustment
• 19 mm wrench or socket
• 13 mm wrench or socket
1. Make sure that the rear wheel is aligned
properly.
2. A properly ad usted chain will have
50mm (2”) free movement behind the
chain block with no load on the bike.
(figure 2)
Figure 2
3.
Sit on the bike and verify that the chain has a
minimum of 12mm (1/2”) free movement when the
chain is at its tightest point.
4. If the chain requires ad usting, loosen the axle
with a 19 mm wrench and tighten the chain by
rotating the ad ustor bolts clockwise (CW) or
loosen the chain by rotating the ad ustor bolts
(CCW).
5. Retighten the axel bolt to 25 ft-lb (34 Nm).
6. Retighten the ad ustor bolt
Rear Brake Maintenance
CAUTION:
Too little brake pedal free-play will allow the brake pads to drag causing the pads
to wear prematurely and possible engine component failures. Too much free-play
will not allow the rider to apply the brakes quickly.
1. Set pedal height/position first, then
2. Set pedal free play.
Brake pedal height can be ad usted with the bolt and nut located under the rear
of the brake pedal. The free-play is ad usted with the ad ustable plunger on the
end of the brake pedal.

12
CAUTION:
Use only DOT 4 brake fluid
Setting rear brake pedal position (see figure 2b):
1. Loosen the lock nut (10mm wrench).
2. Ad ust the brake lever stop (10mm wrench) so that the lever is comfortably
reachable in both:
a. Standing riding position, and Figure 2b
b. Sitting riding position.
3. Tighten the lock nut (10 mm
wrench).
CAUTION:
Adequate pedal free play is required
so that the brake pads do not drag on
the rotor. 1” MINIMUM.
Make sure that the free play locking
clip is installed such that one must
push forward, toward the front of the
bike, to remove. Otherwise the clip is
apt to come undone while riding.
To ad ust (see figure 2b):
1. Loosen the lock nut (10mm).
2. Undo the free play locking clip from around the brake ad ustor (plunger),
with your hand by pushing it forward.
3. Slide the pin of the locking free play locking clip from the brake lever
4. Ad ust as needed by rotating the clevis on the end of the ad ustor
(plunger).
NOTE: Turning the clevis Clockwise will lengthen the ad ustor (plunger),
removing free play from the system, and turning the clevis Counter-Clockwise will
shorten the ad ustor (plunger) adding free play to the system.

13
Brake Bleeding Procedure
Tools Required:
• Front: T10 Torx bit/driver, Cobra bleed kit (BCKG0031)
• Rear: 3mm hex key (Allen wrench, T10 Torx bit/driver, Cobra bleed
kit(BCKG0031)
Procedure:
• Remove the brake fluid reservoir cover.
• Fill the syringe half full with brake fluid.
• Remove the brake caliper bleed screw.
• Attach the syringe to the brake caliper bleed access. Keep the syringe
oriented as not to allow air from the syringe into the system.
• Using the syringe pull fluid through the system. Use caution not to let the
fluid in the reservoir to become low and introduce air into the system.
• Using the syringe push fluid back into the system until the reservoir is full.
• Repeat these actions of pulling and pushing fluid through the system a few
times.
• With the reservoir full, engage the brake lever/pedal and hold it there as if
engaging the brakes.
• While doing this pull on the plunger of the syringe. Doing this will cause a
vacuum in the system. The vacuum will swell the air bubbles which assist
in them moving throughout the system.
• Continue pulling a vacuum and release the brake lever/pedal (careful not
to allow the reservoir to become empty).
• Once again engage the brakes while continuing to pull a vacuum.
• When the reservoir is almost empty stop and push fluid back into the
system.
• Repeat these steps with the vacuum until no more air bubbles can be
removed from the system.
• Remove the syringe. Be sure to keep the caliper below the level of the
reservoir to allow the fluid to run out of the caliper and not allowing air into
the system.
• Reinstall the bleed screw, being sure that the ring is in place.
• Fill the reservoir with fluid (the fluid should be full enough that the fluid
spills out when placing the lid on) and replace the cover.

14
Air Filter Cleaning
Tools recommended for air filter maintenance:
• #2 Phillips head screwdriver
• 4 mm Allen wrench
• Foam filter oil
Procedure
1. Removed the seat with a 4 mm Allen wrench.
2. Remove the filter/air inlet boot from the back of the carburetor with a Phillips
screwdriver
3. Pull the filter / boot assembly out the top of the air box.
4. Clean the filter in a nonflammable solvent to remove the filter oil.
Do not clean the air filter with gasoline or other highly volatile petroleum product.
Diesel fuel or kerosene would be preferred but caution should still be taken. Hot
soapy water works well.
5. Clean the filter in hot soapy water to remove all dirt particles.
6. Allow it to dry thoroughly.
7. Saturate with filter oil and remove excess.
NOTE: The Cobra is equipped with a special designed Air box. It is very
important to keep the air filter clean and properly oiled with high quality water-
resistant foam filter oil. It’s very important to oil your filter consistently each time
because varied amounts of oil will change your carburetor etting.
8. Reinstall the filter / boot assembly making sure the letters “CM” are visible
between the carburetor and air box (figure 4).
Figure 4
NOTE: Make sure you change or clean your filter after each moto. We
recommend carrying multiple filters in your toolbox, one for each practice session
and moto.

15
Fork Maintenance
Cobra strongly recommends that a professional service technician conduct all
internal maintenance other than changing springs and oil. This will help to ensure
safe and consistent operation.
For routine maintenance, the chart below provides suggested service intervals
for common procedures:
Each Ride 10 hours 20 hours As Needed
Bleed excess air X
Change Oil X
Change
eal/ wiper
X
Change Bushings X
Fork Air Bleeding
Tools required
• 3mm hex key (Allen wrench)
During normal operation, both fork legs will build up air pressure. This pressure
acts as an additional spring so it must be bled on a regular basis to maintain
consistent suspension operation. Before each ride, loosen the socket head cap
screw located at the front of each fork cap far enough so that any excess
pressure in the leg is relieved. After excess air is bled off, retighten the screw to 5
in-lb. Be careful not to lose or damage the sealing ring that is located under the
head of each bleed screw.
Fork Oil Replacement
Tools required
• 32mm Fork Cap Tool (MCMUTL32)
• 19mm wrench or socket
• 4 & 5 mm hex key (Allen wrench)
• 9/16 wrench
• Mallet
• 2.5 wt. Bel-Ray fork oil

16
Disassembly procedure
1. Remove the front wheel (19 mm wrench).
2. Remove the brake caliper from the fork leg (4 mm hex key).
3. Loosen the fork caps (32mm fork cap tool).
4. Remove the fork legs from the triple clamps (5 mm hex key).
5. One leg at a time
a. Remove the fork cap from the fork tube.
b. Pull the fork spring down to gain access to the fork cap am nut and
secure it with a 9/16 wrench.
c. Holding in one hand the 9/16 wrench use the fork cap wrench to
unscrew the fork cap from the damper rod.
d. Remove the fork spring pad, and fork spring.
e. Inside the damper rod, the rebound ad ustment screw pin is resting
and will fall out of the damper rod when the fork is inverted. Try to
catch it before it falls into your oil bucket.
f. Invert the fork and allow the oil to drain completely. Working the
damper rod up and down will speed up the draining process.
Assembly procedure
1. Fill the fork with 145ml of fork oil.
2. Work the damper rod up and down to allow the fork cartridge to fill with oil.
3. Install the rebound ad ustment screw pin into the damper rod.
4. Install the fork spring and spring pad.
5. Extend the damper rod completely and Compress the fork spring enough to
begin threading the fork cap back onto the damper rod.
6. Make sure that the fork cap threads onto the damper rod completely before it
makes contact with the amnut.
7. Tighten the amnut.
8. Tighten the fork cap to the fork leg outer
9. Pump the fork leg several times to verify that it operates smoothly.
10. Install each leg back into the triple clamp. Torque each pinch bolt to 8N-m (6
ft-lb) making sure both legs are set to the same height in the clamps.
11. Reinstall the brake caliper.
12. Reinstall the front wheel (25 ft-lb, 34 Nm).
Cobra Frictional Drive (V3 CFD)
The Cobra Frictional Drive (CFD) is essentially an ad ustable slip clutch that
dissipates torque spikes transmitted from the rear wheel to the rest of the drive
line and engine. Instead of these torque spikes potentially damaging internal
components, the CFD allows the transmission to slip with respect to the engine.
For this to occur, the CFD must function properly by ‘slipping’ above a minimum
torque value.
The safe minimum slip torque of the CFD should be checked every 2 hours of
operation, after break-in.

17
The slip torque value should be above 60 ft-lb (81 Nm) measured at the sprocket.
To properly measure the minimum torque at which the CFD (Cobra
Frictional Drive) slips
1. Access the slip clutch by draining the oil and removing
the cover exposing the CFD.
2. Brace the CFD gear from turning with a suitable device
(Cobra tool EAMU0004 or similar).
3. Install the Sprocket Socket CFD torque checking tool
(MCMUTL15) on the sprocket and secure with the
supplied screw and ensure that the tool is completely
up against the sprocket
4. Verify with a torque wrench applied to the Sprocket
Socket that the V3 CFD does not slip below 81 Nm (60
ft-lb) in either direction.
5. If there is slippage below 81 Nm (60 ft-lb)
remove the cotter pin and tighten the castle
nut on the CFD one more position (it is a left
hand thread nut so you must turn it
counter clockwise)
CAUTION:
Do not check earlier versions of the CFD with this method! The torque valves
required at the sprocket would be much higher
HINT:
This V3 CFD torque checking method is possible do to with the chain on. Just put
the bike on a stand so that the rear wheel can turn freely.
HINT:
The CFD hubs can be removed with the universal puller (MCMUTL70).

18
Parts
Parts – Airbox and Inlet System
Airbox and Inlet System
REF #
PART #
DESCRIPTION
1 ZCCS0001 GASKET – REED TO CYLINDER
2 ECMU0246 REED CAGE ASSEMBLY WITH REEDS VFORCE
3 RCCS0002 INLET MANIFOLD
4 HCWF0601 6mm FLAT WASHER
5 HCBC0603 M6X30mm SOCKET HEAD CAP SCREW
6 MCKGHO04 HOSE CLAMP – CARBURETOR TO MANIFOLD
7 RCCM0001 CARBURETOR 14mm
8 RCCM1301 VELOCITY STACK
9 MCKGHO01 HOSE CLAMP – AIR BOOT TO CARBURETOR
10 RCCJ0004 AIR FILTER WITH BOOT
11 RCMU0405 AIR BOX - JR
12 TCCJ0004 MUD FLAP
13 HCBB0612 M6X12mm BUTTON HEAD BOLT (2 REQ’D)
14 RCMU1407 BRACKET – MUD FLAP
15 ECCS0030 REEDS REPLACEMENT KIT
16 FCMU0026 FUEL LINE 5” (NOT SHOWN)
17 MCMUCL04 HOSE CLAMPS – FUEL LINE (NOT SHOWN)
18 RCMU0022 VENT HOSE (NOT SHOWN)

19
Parts – Bars and Controls
Bars and Controls
REF #
PART #
DESCRIPTION
1 FAMU0013 HANDLEBAR - ALUMINUM
2 TCMU0008 GRIPS (SET OF TWO) – SCOTT WAFFLE
3 FCMU0066 THROTTLE ASSEMBLY
4 FCPW0004 CABLE COVER
5 FCMU0021 THROTTLE COVER
6 FCMU0019 THROTTLE CABLE
7 BAKG0003 BRAKE ASSEMBLY FRONT
8 FCMU0033 KILL SWITCH ASSEMBLY
9 HCBC0803 M8X30mm SOCKET HEAD CAP SCREW (4) REQ’D
10 HCBC0825 M8X25mm SOCKET HEAD CAP SCREW (4) REQ’D
11 TKMU0404 BAR MOUNT KIT, SHORT (1 REQ’D) STANDARD
11A TKMU0403 BAR MOUNT KIT, TALL (1 REQ’D)
ACCESSORY BCKG0023 ALLOY BRAKE LEVER W/BALL
ACCESSORY BCKG0024 BRAKE PERCH ASSY W/LEVER & BALL
ACCESSORY BAKG0004 SHIELDED BRAKE HOSE ASSEMBLY

20
Parts - Carburetor
48 RCMU0048 85 RCMU0085 92 RCMU0092 99 RCMU0099
50 RCMU0050 86 RCMU0086 93 RCMU0093 100 RCMU1100
52 RCMU0052 87 RCMU0087 94 RCMU0094 101 RCMU1101
55 RCMU0055 88 RCMU0088 95 RCMU0095 102 RCMU1102
60 RCMU0060 89 RCMU0089 96 RCMU0096
65 RCMU0065 90 RCMU0090 97 RCMU0097
91 RCMU0092 98 RCMU0098
PILOT JET MAIN JET
Carburetor
REF. #
PART #
DESCRIPTION
RCCM0001 COMPLETE CARBURETOR 14MM
1 RCMU0305 SLIDE - #40
2 RCMU0601 NEEDLE - W7
3 RCMU0024 ATOMIZER AU2.62
4 RCMU00xx MAIN JET, xx denotes size
5 RCMU00xx PILOT JET, xx denotes size
7 RCMU0301 FLOAT
8 RCMU0102 RUBBER CABLE CAP SEAL
9 RCMU0003 CABLE ADJUSTOR
11 RCMU0006 TOP CARB SCREW
12 RCMU0106 CARB TOP
13 ZCMU0007 TOP CARB GASKET
14 RCMU0004 SLIDE SPRING
15 RCMU0028 NEEDLE RETAINER PLATE
16 RCMU0007 NEEDLE CLIP
17 RCMU0204 CHOKE ASSEMBLY
NOT SHOWN
RCMU0209 O-RING CHOKE ASSEMBLY
20 RCMU0009 FUEL MIXTURE SCREW
21 RCMU0011 IDLE ADJUSTMENT SCREW
25 RCMU0103 FLOAT BOWL GASKET
26 RCMU0107 FLOAT NEEDLE
27 RCMU0012 DIFFUSER
28 RCMU0016 FLOAT RETAINER PIN
29 RCMU0108 FLOAT BOWL
30 HCWF0401 WASHER 4MM FLAT
31 RCMU0201 BOTTOM FLOAT SCREW
NOT SHOWN
RCCM1301 VELOCITY STACK – 05 style
NOT SHOWN
RCCM0314 14MM CARB RESTRICTOR
NOT SHOWN
FCMU0026 FUEL LINE 5”
NOT SHOWN
MCMUCL04 HOSE CLAMPS – FUEL LINE
NOT SHOWN
RCMU0020 ELBOW - CARB VENT
NOT SHOWN
RAMU0001 CANNULUS - Y STYLE CARB VENTS
NOT SHOWN
RCMU0031 SLIDE - #30
NOT SHOWN
RCMU0250 SLIDE - #50
NOT SHOWN
ECKG0160 SLIDE - #60
NOT SHOWN
RCMU0026 NEEDLE - W4
NOT SHOWN
RCMU0602 NEEDLE - W16