Engine
Poor performance
POOR PERFORMANCE
Possible Cause Operation
The carburettor is dirty; fuel pump or vacuum valve damaged Remove, wash with solvent and dry with compressed air or re-
place
Excess of encrustations in the combustion chamber Descale the cylinder, the piston, the head and the valves
Incorrect timing or worn timing system elements Time the system again or replace the worn parts
Muffler obstructed Replace
Air filter blocked or dirty. Remove the sponge, wash with water and car shampoo, then
soak it in a mixture of 50% petrol and 50% specific oil. Press
with your hand without squeezing, allow it to drip dry and refit.
Automatic starter failure Check: mechanical movement, electric connection and fuel
supply, replace if required.
Oil level exceeds maximum Check for causes and fill to reach the correct level
Lack of compression: parts, cylinder and valves worn Replace the worn parts
Transmission belt worn Replace
Inefficient automatic transmission Check the rollers, the pulley movement and make sure the
drive belt is in good conditions; replace the damaged parts and
lubricate the moveable driven pulley with specific grease.
Clutch slipping Check the clutch system and/or the bell and replace if neces-
sary
Overheated valves Remove the head and the valves, grind or replace the valves
Wrong valve adjustment Adjust the valve clearance properly
Valve seat distorted Replace the head assembly
Defective floating valve Check the proper sliding of the float and the functioning of the
valve
Rear wheel spins at idle
REAR WHEEL ROTATES WITH ENGINE AT IDLE
Possible Cause
Operation
Idling rpm too high Adjust the engine idle speed.
Clutch fault Check the springs / clutch masses
Starting difficulties
DIFFICULT STARTING
Possible Cause
Operation
Altered fuel characteristics Drain off the fuel no longer up to standard; then, refill
Rpm too low at start-up or engine and start-up system dam-
aged
Check the starter motor, the system and the torque limiter
Incorrect valve sealing or valve adjustment Inspect the head and/or restore the correct clearance
- Engine flooded. Try starting-up with the throttle fully open. If the engine fails to
start, remove the spark plug, dry it and before refitting, make
the motor turn so as to expel the fuel excess taking care to
connect the cap to the spark plug, and this in turn to the ground.
If the fuel tank is empty, refuel and start up.
Automatic starter failure Check: mechanical movement, electric connection and fuel
supply, replace if required.
Air filter blocked or dirty. Remove the sponge, wash with water and car shampoo, then
soak it in a mixture of 50% petrol and 50% specific oil. Press
with your hand without squeezing, allow it to drip dry and refit.
Faulty spark plug or incorrect ignition advance Replace the spark plug or check the ignition circuit components
Carnaby 125 - 200 Troubleshooting
TROUBL - 57
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