Troubleshooting
SYMPTOM
Engine tends to stall at
full throttle
Engine tends to stall at
idle
Fuel consumption
excessive
Clutch grapping or
irregular operation
POSSIBLE CAUSE
Main jet dirty. Carburetion lean
Water in carburettor
Float level incorrect
Fuel supply circuit faulty
Filter box leaky
Idling jet dirty
Starting device stays open
Spark plug faulty or spark advance incorrect
End-compression pressure too low
Idle speed wrongly tuned
Cut-off device broken
Valve gear timing incorrect
Air filter clogged or dirty
Starting device faulty
Fuel pump faulty
Jets loose
Float level incorrect
Clutch faulty
REMEDY
Wash the jet with solvent and dry it with
compressed air
Drain water from the float chamber using the
specially designed drain screw
Restore the correct float level
Check and if necessary replace the pump.
Check the duct seal. Check the electric pump
wiring.
Check and if necessary replace
Wash with solvent and dry with compressed
air
Check electrical connections, circuit continu-
ity, mechanical sliding, and power supply
Replace the spark plug or check the ignition
circuit components
Check the seal of the thermal unit and re-
place any worn components
Tune up using a rev counter
Check operation of the valve, membrane and
spring; check if the air adjusters are clean
Restore the correct timing and check the
valve gear components
Replace
Check electrical connections, circuit continu-
ity, mechanical sliding, and power supply
Check the feeding, replace if necessary
Check that the main and idling jets are se-
curely seated
Check and restore the correct fuel level in the
float chamber
Check for grease on the clutch weights.
Check that the area of contact of the clutch
weights with the bell housing is chiefly at the
centre and equivalent for the three weights.
Check that the bell housing is not scored or
abnormally worn.
3-22
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