Cobra 2006 ECX70 Manuel utilisateur
ECX70
Owners
Parts
Service
Tuning
1
For parts orders contact your local dealer
To locate your closest Cobra dealer
log on to
www.cobramotorcycle.com
or call
(330) 549-9600
If you need technical assistance
contact your local dealer or call
the Cobra Technical Support Hotline at
(330) 549-9603
Cobra Motorcycle MFG., Inc.
11511 Springfield Road
North Lima, Ohio 44452 MCEX2006.3
2
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 ECX70 IS ACOMPETITION MODEL ONLY AND IS NOT
MANUFACTURED FOR, NOR SHOULD IT BE USED ON PUBLIC STREETS, ROADS
OR HIGHWAYS.
THE USE OF THIS ATV SHOULD BE LIMITED TOPARTICIPATION IN SANCTIONED
COMPETITION EVENTS UPON A CLOSED COURSEBY 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 RESPONSIBILITYAS THE OWNER OF THIS COBRA PRODUCT OR AS
THE PARENT, OR LEGAL GUARDIAN OF THE OPERATOR, TO KEEP THISCOBRA
PRODUCT IN PROPER OPERATING CONDITION.
THIS ATV WAS DESIGNED FOR RIDERS THAT WEIGH LESS THAN 110 LBS WITH
FULL RIDING GEAR AND SHOULD NOT BE OPERATED BY RIDERS THAT WEIGH
MORE THAT.
BE SURE THAT THE RIDER ALWAYS WEARS ADEQUATE SAFETY GEAR
EVERYTIME HE OR SHE RIDES THEIR COBRA ATV.
IMPORTANT SAFETY NOTICE
Failure to follow WARNING instructions could 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.
3
Table Of Contents
General Information.........................................................................................................5
Specifications -General..............................................................................................5
Specifications -Torque Values ..................................................................................6
Optional Suspension Components............................................................................7
Break-In Procedure......................................................................................................8
Starting Procedure.......................................................................................................9
General Tips................................................................................................................10
Maintenance....................................................................................................................11
Schedule & Tips .........................................................................................................11
M1: Replacing Transmission Lubricant...................................................................11
M2: Chain adjustment................................................................................................12
M3: Air Filter Cleaning ...............................................................................................13
M4: Front end..............................................................................................................15
Toe in adjustment...................................................................................................15
Steering....................................................................................................................15
Parts.................................................................................................................................16
Parts –Air Inlet System.............................................................................................16
Parts –Bars and Steering.........................................................................................17
Parts –Bumper, Nerf & Grab Bars..........................................................................18
Parts –Carburetor......................................................................................................19
Parts –Clutch Actuation............................................................................................20
Parts –Coolant System.............................................................................................21
Parts –Electrical System..........................................................................................22
Parts –Engine Clutch................................................................................................23
4
Parts –Engine –Clutch / Kick Cover..................................................................24
Parts -Engine -Ignition Side................................................................................25
Parts -Engine –Kick Mechanism........................................................................26
Parts –Engine –Shift Mechanism ......................................................................27
Parts –Engine –Top End.....................................................................................28
Parts -Engine -Transmission..............................................................................29
Parts –Exhaust System............................................................................................30
Parts -Front A-Arms & Steering Upright................................................................31
Parts –Front Brakes..................................................................................................32
Parts –Front Shock...................................................................................................33
Parts –Miscellaneous ...............................................................................................34
Parts –Plastic Bodywork & Seat.............................................................................35
Parts –Rear Brake.....................................................................................................36
Parts –Rear Drive......................................................................................................37
Parts –Rear Shock....................................................................................................38
Parts –Swingarm Assembly.....................................................................................39
Parts –Tie Rod Assembly........................................................................................40
Engine Parts / Service...................................................................................................41
ES1: Fuel & Air System.............................................................................................41
Reeds.......................................................................................................................41
Carburetor Cleaning...............................................................................................42
ES2: Exhaust ..............................................................................................................43
Tuning ..............................................................................................................................43
5
General Information
Specifications -General
Items ECX70
Dimensions
Wheelbase 42” (1067mm)
Width Front / Rear 43” / 46” (1092mm / 1168mm)
Weight 210 lb
Engine
Type 2-stroke, single cylinder, reedvalve
Cooling system Liquid-cooled
Displacement 64.8 cc (3.95 Cubic inches)
Bore and stroke 43 mm x 44.6 mm
Ignition system Electronic
Spark plug Champion 8339
Gap 0.023” –0.025” (0.58–0.64 mm)
Fuel type 93 octane pump gasoline
OTHER RACE FUELS ARE NOT RECOMMENDED
Oil type Cobra Venom 2-cycle Race Oil
Fuel / oil mix ratios 32:1
Ignition timing .050” (1.3mm) BTDC
Carburetion 26mm Mikuni VM
Main jet
190
Slow (Pilot) jet
50
Jet needle
5F21, 4th position from the top
Float height
Transmission
Speed Six speed
Clutch Manual hydraulic
Final drive ratio 13/48 T
Transmission / clutch oil type 85W 90 Gear Lubricant
Quantity
530 ml (18 oz)
6
Chassis
Tire Pressure front / rear (7 psi / 5 psi)
Travel, front / rear 240mm / 247mm (9.4” / 9.7”)
Race sag, front / rear 96mm / 99mm (3.8” / 3.9”)
Free sag, front / rear 38mm / 40mm (1.5” / 1.6”)
Specifications -Torque Values
Torque Value
ENGINE Fastener ft-lb in-lb Nm
Size &
Remarks
Cylinder head nuts 14 170 19 7mm
Engine oil drain 336 48 x 1.25
Engine oil fill 224 2.7 14 x 1.0
Spark Plug (SP)
(SP) (SP)
14 x 1.25
Crank case half 560 6.8 6 x 1.0
Crank case cover 560 6.8 6 x 1.0
Flywheel rotor nut 40 480 54 10 x 1.25 (G)
Clutch hub 40 480 54 10 x 1.25 (G)
Units of mm unless otherwise specified
(G) denotes the use of wicking / bearing retainer (green) thread locking agent to
applied to the mating surfaces of the two components but not the threads.
(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
Torque Value
CHASSIS Fastener ft-lb in-lb Nm
Size &
Remarks
Handle bar mounts 15 177 20 8 x 1.25
Handle bar clamps 15 177 20 8 x 1.25
Front engine mount 22 265 30 8 x 1.25
Rear brake lever pivot 10 120 13.6
8 x 1.25
Upper shock mount 40 480 54 10 x 1.5
Lower shock mount 40 480 54 10 x 1.5
Swingarm pivot 21 250 28 14 x 2.0
Units of mm unless otherwise specified
(R)designates that the application requires the use of high strength (red) thread
locking agent applied to the threads.
(B)designates that the application requires the use of medium strength (blue)
thread locking agent applied to the threads.
Optional Suspension Components
Front shock springs
Weight of Rider (lb) Helper Main
Less than 65 SCEXA145 (RED, 145 LB/IN)
65 to 100
SCEX1080 (RED,
80 LB/IN) SCEXA155 (YELLOW, 155
LB/IN)
Greater than 100 SCEX1095 (YELLOW,
95 LB/IN) SCEXA165 (BLACK, 165 LB/IN)
Rear shock springs
Weight of Rider (lb) Helper Main
Less than 65 SCEX0110 (WHITE,
110 LB/IN)
SCEX1350 (RED, 350 LB/IN)
65 to 100 SCEX0125 (GOLD,
125 LB/IN) SCEX1375 (WHITE, 375 LB/IN)
Greater than 100 SCEX0150 (150 LB/IN) SCEX0400 (YELLOW, 400 LB/IN)
8
Break-In Procedure
Your Cobra Motorcycle is a close-tolerance high performance machine and
break-in time is very important for maximum life and performance. The ECX70
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
93 octane pump gas, or Sunoco MO2X , with Cobra’s specially formulated Cobra
Venom 2-cycle Race Oil. (Part # MCMUOL02)
CAUTION:
Failure to use proper fuel or oil 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.
•First 5 minute period, operate the bike in neutral with a combination of idle
and high RPM operation. (avoid prolonged high RPM rev it good at least
once or twice per minute)
•Allow the engine to cool
•Ride for 15minutes maximum, avoiding prolonged high RPM operation.
•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).
oClean the carburetor bowl.
oChange the transmission / clutch lubricant.
oReplace the fuel filter.
•After 8 hours of operation have a Certified Cobra Mechanic change the
shock oils.
•Your bike is now ready for the highest level of competition!
9
Starting Procedure
Before starting the machine inspect the following:
•Insure that the fuel tank contains an adequate volume of fuel / oil mixture to
complete the distance required. (93 octane pump gas with Cobra’s specially
formulated Cobra Venom 2-cycle Race Oil)
•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 do not have improper wear.
•Inspect the frame, for;
oCracks in the metal.
oCracking paint which might indicate overly stressed material.
•Verify that the handlebars are tight.
•Check the throttle for;
oSmooth operation and sound closing.
oFrayed strands of the cable inside the throttle housing.
•Check for loose bolts and nuts, and re-torque as necessary.
•Verify that the air filter is clean and properly saturated with oil.
•Turn the fuel on by rotating the fuel petcock knob tothe vertically downward
position (reserve position is horizontally inward).
CAUTION:
For best results from your Cobra ATV use only the recommended fuels. Testing
has shown that most ‘race’ fuels actually degrade performance.
When your pre-ride inspectionis complete the bike may be started. For a cold
engine follow this procedure.
1. Reaching down to the carburetor, on the left side of the bike, push down on
the black choke lever.
2. Kick start the engine.
3. Rev the engine in short spurts, turning the throttleno more than 1/4 open
until the engine will run without the choke.
4. Verify a functional engine shut-off switch by shutting off the engine.
5. 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. 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. Make sure your
engine is properly warmed up before racing.
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