Engine Tends To Cut-Off At Full Throttle/Idle - Derbi GP1 125-250 c.c. Workshop Manual

ENGINE TENDS TO CUT-OFF AT FULL THROTTLE
T
HE ENGINE TENDS TO STOP AT MAX GAS OPENING
POSSIBLE CAUSE
Defective feeding circuit
Incorrect float level
Water in the carburettor
Maximum jet dirty - lean carburetion
ENGINE TENDS TO CUT-OFF AT IDLE
T
HE ENGINE TENDS TO STOP AT IDLE
POSSIBLE CAUSE
Wrong timing
Cut-off device failure
Idle adjustment is incorrect
Compression end pressure too low
Faulty spark plug or incorrect ignition ad-
vance.
Starter remains pressed
Idle nozzle dirty
239
WORK
Check the feeding pump, the vacuum inlet, and the
duct seal, replace if required.
Restore the level in the basin by bending The fuel inlet
pin thrusting reed on the float so as to have the float
parallel to the basin plane with upturned carburettor.
Empty the basin by the special drain.
Wash with solvent and dry with compressed air.
WORK
Adjust the timing and check the timing components.
Check the efficiency of the valve, membrane, spring,
and the cleaning of the sponge filter.
Adjust with the rpm counter.
Check the seals of the thermal unit and replace worn
components.
Replace the spark plug or check the ignition circuit
components
Check: electric connections, circuit continuity, mecha-
nical sliding, and presence of power; replace, if requi-
red
Wash with solvent and dry with compressed air