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 KING IS A COMPETITION MODEL ONLY AND IS NOT
MANUFACTURED FOR, NOR SHOULD IT B E USED ON PUBLIC STREETS, ROAD S
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 OPE RATED BY RIDERS THAT WEIGH
MORE THAT.
BE SURE THAT THE RIDER ALWAYS WEARS ADEQUATE SAFETY GEAR
EVERYTIME HE OR SHE RIDES THEIR COBRA MOTORCYCLE.
IMPORTANT SAFETY NOTICE
Failure to follow WARNING instructions c ould result in severe injury 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.
2
Table Of Contents
GENERAL INFORMATION ................................................................................... 5
INDEX ................................................................................................................. 76
4
General Information
Items
KING
Dimensions
Wheelbase
39” (991mm)
Wheel size
10” (254mm) rear, 12” (305mm) front
Seat height
26” (660mm)
Engine
Type
2-stroke, single cylinder, reed valve
Cooling system
Liquid-cooled
Displacement
49.8 cc
Bore and stroke
39 mm x 41.7 mm
Ignition system
Electronic, analog advance
Spark plug
Champion 8339-1, 8332-1 hotter, 8904-1 colder
Gap
0.023” – 0.025” (0.58 – 0.64 mm)
Ignition timing
0.040” (1.14 mm) Before To Dead Center (BTDC)
Fuel type
High octane pump gasoline
Oil type
Cobra Venom2-cycle Race Oil
Fuel / oil mix ratios
Between 32:1 and 40:1 (after engine Break-In is
Carburetion
19 mm Dell’Orto
Main Jet
96
Slow (Pilot) jet
65
Float Height
16mm + 0.5mm (0.63” + 0.020”)
Coolant
Liquid Performance Mini Coolant / Antifreeze
Transmission
Speed
Single
Final drive ratio
14/38 T
Chain
100 links 420
Transmission / clutch oil type
Cobra Venom 3 Shoe Clutch Milk
Quantity
235 ml (8.0oz)
Specifications - General
RACE FUELS ARE NOT RECOMMENDED
complete)
5
Chassis
Front tire
2.50 - 12
Pressure
16 psi minimum
Rear tire
2.75 - 10
Pressure
16 psi min. (20 psi for hard pack or rocky conditions)
Front fork
Cobra 30mm USD
Fork oil type
SAE 10 weight
Fork oil amount
105 ml (3.5oz)
Weight of Rider (lb)
Fork Spring
Shock Spring
Less than 51
9 lb/in,
KCKG0109
SCKGOH85 (gray, 185 lb/in)
51 - 60
12 lb/in,
KCKG1201
SCKGOH95, (yellow, 195 lb/in)
Greater than 60
15 lb/in,
KCKG0015
SCKGO205, (gold, 205 lb/in)
Damping Rate
Fork Valving
(base valve)
Fork Valving
(mid valve)
Shock Valving
Soft (fast)
KAKG0013
KAKG0016
SCKGOH24A
Standard
KAKG0014
KAKG0017
SCKGOH24
Hard (slow)
KAKG0015
KAKG0018
SCKGOH24B
Optional Components
Call your dealer, or the factory, for details
• Carburetor jets
• Flat clutch washers (see clutch service section)
• Pre filter for the airbox
• Sprockets
o Front
o Rear
• Suspension Springs
• Suspension Valving
Compression
• Tires
• Tubes or ‘Tire Balls’
6
Rebound
(kit)
Specifications - Torque Value s
Cylinder head
nuts
Crankcase
bolts
Stator cover
bolts
Clutch cover
bolts
Engine mount
bolts
Swingarm
Pivot
Intake manifold
bolts
Rear Sprocket
Bolts
Fork cartridge
rod
Triple clamp
bolts
Ignition rotor
nut
Fastener
Spark plug (SP) (SP) (SP) M14 x 1.25
Stator bolts 2.1 25 2.8 M5 X 0.8
Clutch nut 40 480 54 M10 x 1.25*
Clutch bolts 14 170 19 M6 x 1.0
Front axle nut 25 300 34 M12 x 1.25
ft-lb in-lb Nm
8.8 105 12 M6 x 1.0
8.8 105 12 M6 x 1.0
1.7 20 2.3 M4 X 0.75
5.8 70 7.9 M6 X 1.0
22 265 30 M8 X 1.25
Torque Value
Size &
Remarks
21 250 28 M14 X 2.0
4.6 55 6.2 M6 X 1.0
Rear Axle Bolt 25 300 34 M12 X 1.25
18 216 24 7 mm
12 144 16
6 72 8 M6 x 1.0
Fork cap 5 60 6.7 1.25” x 18
40 480 54 M10 x 1.25*
* Apply high strength thread locking agent when installing
(SP) To apply the proper torque to the spark plug when inserting, one must first
screw the spark plug in until the metal gasket ring causes resistance and then
turn another 1/8 to ¼ turn.
7
Break-In Procedure
Your Cobra KING is a close-tolerance high performance machine and break-in
time is very important for maximum life and performance. The KING can be
ridden hard after the first ½ hour break-in time but it is recommended that no
adjustments are made to the carburetion or suspension until the full 8 hours of
bike break-in has elapsed. Also, after the engine, transmission, and drive train
have been broken-in for the full 8 hours, the bike will be faster!
Use a fuel / oil mixture of 32:1 for the full 8 hour break-in period. Be sure to use
high-octane pump gas, with Cobra’s specially formulated Cobra Venom2-cycle Race Oil. (Part # MCMUOL02)
CAUTION:
Failure to use proper fuel, oil, or fuel/oil m ixture 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.
• Cool and inspect bike for loose fasteners.
• Next ½ hour of operation, avoid prolonged operation at Wide Open Throttle.
• After 1 hour of operation
oCheck for loose bolts and nuts on the bike and retighten as
necessary (proper toque values are listed under Specifications).
o Clean the carburetor bowl.
o Change the transmission / clutch lubricant.
• After 8 hours of operation
o Change the fork oil.
o Have a Certified Cobra Mechanic change the shock oil.
• Your bike is now ready for the highest level of competition!
NOTE:
During break-in the bike will likely lose som e engine coolant through the radiator
overflow hose. Losing up to 4 oz (120 ml, ½ cup) is normal. Proper c oolant 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.
8
Never open the radiator cap of a machine that has a hot or warm engine or one
that has recently been ridden. Burning and scalding could occur.
CAUTION:
It is important that the radiator cap is installed correctly and complet ely otherwise
engine damage could occur.
Starting Procedure
Before starting the machine inspect the following:
• Check for proper tire pressure in both tires.
• Observe the chain tension and adjust if necessary.
• Observe the coolant level and fill if necessary.
• Verify that the chain rollers and sliders do not have improper wear.
• Verify that the handlebars are tight.
• Check the throttle for smooth operation and sound closing.
• Check for loose bolts and nuts, and re-torque as necessary.
• Verify that the air filter is clean and properly saturated with oil.
• Insure that the fuel tank contains an adequate volume of fuel / oil mixture to
complete the distance required. (High octane pump gas with Cobra’s
specially formulated Cobra Venom2-cycle Race Oil)
•Turn the fuel on by rotating the fuel petcock knob to the vertically downward
position (reserve position is horizontally forward)
CAUTION:
For best results from your Cobra Motorcycle use only the recommended fuels.
Testing has shown that most ‘race’ fuels actually degrade performance.
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 when it's cold or slightly warmed up. Also, for
best clutch performance, warm up the bike before taking off.
9
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.
General Tips
1. Always wear a helmet and other protective riding gear.
2. 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.
3. Make sure your riders’ foot is not resting on the foot brake while they are
riding.
4. Evaluate the bikes jetting only after it has been warmed up to race
temperatures.
5. A properly maintained machine is safer, faster, and more fun to ride.
6. Filling your transmission with more than 8.0 oz (235ml) of lubricant may
help to transfer heat from the clutch, but be aware that this extra oil will
increase the frictional drag on the engine, thus reducing power, and will
often get purged out the crankcase vent during riding.
7. New chains will stretch on first use. Never install a new chain prior to a
race. Always ‘break’ them in during practice.
8. 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).
a. Example, Acxxxx5xxx is a 2005 MY King.
Maintenance
Schedule & Tips
It is important that you adhere to this maintenance schedule so as to promote the
longevity of your Cobra Motorcycle.
•Between each ride
o Check t he air f ilt er (clean and re-oil as necessary).
o Ins ur e the smooth operation of the throttle cable (throttle soundly
‘clacks’ shut).
oCheck f or fr ayed s t rands of the throttle cable inside the throttle housing
and replace if necessary.
o Check f or adequate tire pressures and adjust if necessary.
o Check al l nut s and bolt s for proper torque and re-torque if necessary.
o Spray all m oving par ts with WD40 or other light oil.
o Check dr ive chain for
Proper tension and adjust if necessary.
Adequate lubrication and lubricate if necessary.
oIns ur e that the ignition stator and rotor are clean and dry.
10
oCheck t he f rame for cracks in the metal or cracks in the paint that
might indicate that the metal has been stressed beyond it’s safe limits.
Replace or get properly rewelded as necessary.
oIns pect the rear sprocket damper plate for bending or warping.
Straighten or replace if more than 1/16” (1.6 mm) from flat.
oCheck t he r im s f or signs of stress, like cracks around the rim, spokes
and hub.
•Every 2 hours of operation o Replace the transmission oil.
•Every 10 hours of operation
o Replace the fork oil.
o Have the shock oil replaced by a Certified Cobra Mechanic.
CAUTION:
1. 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.
2. 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.
3. 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.
4. If your kick-starter lever does not return to the rubber bumper, use WD-40
or light penetrating oil under the plastic cover behind the spring on the
shaft. The shaft is a very close fit to the case and also has an O-RING in it
and is difficult to get lubrication to which may cause binding. If it does not
loosen up, remove the kick-starter cover and kicking assembly. Grease the
shaft.
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. Lean bike against something or set on stand with oil drain hole.
3. Using a 13 mm wrench, remove the oil drain bolt located on the right side of
the engine, on the clutch cover, near the brake lever (Item 2, figure 1).
Figure 1
4. After it has drained, reinstall the bolt being sure that the copper gasket is in
place. Torque to 15 Nm (11 ft-lb).
5. Reapply oil from oil fill plug 235 cc (8.0 oz) Cobra Venom 3 Shoe Clutch Milk
thru the oil fill plug.
NOTE:
Lean bike over onto it’s left hand side so that the clutch cover is up unless you
have a squeeze bottle.
6. Reapply the oil fill plug, hand tight, being sure the fiber gasket is in place.
CAUTION:
Cobra has spent considerable time and money developing t he proper lubrication
to handle the harsh environment of the automat ic clutch and transmission of this
motorcycle. Cobra’s specially developed Cobra Venom 3 Shoe Clutch Milk (Part
# MCMUGF01) was formulated to provide superior lubrication and cooling
12
capability over extended periods of time and is the recommended lubricant for
1. Make sure that the rear
Push down on the seat,
sion down to where the
chain is tightest. At this
e should be a
With the rear wheel
a minimum of 2.5” of
slack between the swing
arm and the chain.
your Cobra motorcycle.
Chain adjustment
Figure 2
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 all the rider to apply the brakes quickly.
1. Set pedal height/position first, then
2. Set pedal free play.
Brake pedal height can be adjusted with the bolt and nut located under the rear
of the brake pedal. The free-play is adjusted with the adjustable plunger on the
end of the brake pedal.
CAUTION:
Use only DOT 4 brake fluid
Setting rear brake pedal position (see figure 2b):
1. Loosen the lock nut (10mm wrench).
2. Adjust the brake lever stop (10mm wrench) so that the lever is comfortably
reachable in both:
a. Standing riding position, and
b. Sitting riding position.
3. Tighten the lock nut (10 mm wrench).
wheel is aligned properly.
2.
compressing the suspen-
point, ther
minimum of 1” of slack.
3.
elevated, there should be
13
Figure 2b
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 adjust (see figure 2b):
1. Loosen the lock nut (10mm).
2. Undo the free play locking clip from around the brake adjustor (plunger),
with your hand by pushing it forward.
3. Slide the pin of the locking free play locking clip from the brake lever
4. Adjust as needed by rotating the clevis on the end of the adjustor
(plunger).
NOTE:
Turning the clevis Clockwise will lengthen the adjustor (plunger), removing free
play from the system, and turning the clevis Counter-Clockwise will shorten the
adjustor (plunger) adding free play to the system.
Air Filter Cleaning
Tools recommended for air filter maintenance:
• Filter oil
• Grease
• Proudly nothing other than that!
CAUTION:
It is very important to keep it clean and properly oiled with high quality waterresistant foam filter oil. It is also very import ant to oil your filter consistently each
time because varied amounts of oil will change your carburetor jetting.
14
Make sure you change your filter after each moto. We recommend carrying
three or more filters in your toolbox.
1 for practice
1 for the each moto
When washing your bike, it may be handy to remove the airboot and hose out the
airbox. When doing so, cover the carburetor inlet with a suitabl e shield capable of
keeping water from entering the engine. Cobra has a rubber cap for the
carburetor inlet (part # RCMU0109).
Fork Oil Replacement
Tools required
• Two 19 mm wrenches or sockets
• 4 & 5 mm hex key (Allen wrench)
• 1” wrench or socket
• 10 wt fork oil
Disassembly procedure
1. Remove the front wheel (19 mm wrench).
2. Remove the brake caliber from the fork leg (4 mm hex key).
3. Loosen the fork caps (1” socket).
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 leg.
b. Separate the fork cap from the damper rod.
c. Pull out t he fork spring.
d. Place upside down over a suitable pan, tray, or container.
e. Work the damper rod up and down several times.
f. Allow it to drain completely.
Assembly procedure
1. Fill the fork leg with 3.5 oz (105 ml) 10 wt fork oil.
2. Measure the fork oil level to the top of the fork tube with the leg collapsed,
and record for tuning purposes.
3. Install the fork spring.
4. Reconnect the damper rod to the fork cap (12 ft-lb, 16 Nm).
CAUTION:
The damper rod is hollow and will break if the nut is over tightened.
5. Reinstall the for cap into the fork leg (5 ft-lb, 6.7 Nm)
6. Reinstall the fork legs into the clamps (6 ft-lb, 8 Nm).