2. Service Maintenance Information
2-12
Carburetor Idle Speed Adjustment
Caution
z Inspection & adjustment for idle speed have
to be performed after all parts in engine had
been adjusted in specification.
z Idle speed check and adjustment have to be
done after engine is being warned up. It
around operates engine from stop to running
for 10 minutes.
Remove the body cover.
Park the scooter with main stand after warned up
engine. According to the required idling and air
screw to adjust to specified idle speed.
Idle speed: 1900±100 rpm
Cylinder Compression Pressure Test
Remove the left body cover, and warn up engine.
Stop the engine and remove the spark plug. Insert
the compression gauge and wide open the throttle,
and then rotate the engine by means of the
starting motor.
Compression pressure: 7±1 kg/cm
2
Probable causes for low compression pressure.
z Damaged cylinder head gasket.
z Worn piston ring
z Worn cylinder
Probable causes for high compression pressure.
z Carbon on the combustion chamber or cylinder
head
Pilot screw
Idle speed adjustment screw
Compression pressure gauge
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