CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 4 -
3.1.5 Carburetor idle speed
● Idle adjustment should be made with the
engine warmed up.
Remove cover
After the engine warms up, connect it to an
engine revolution counter.
Adjust idle screw until specified revolution is
obtained.
Minimum idling stabilized speed:1900 ±
190rpm
Readjust the screw if idle speed is not
steady or fuel cannot be properly applied.
3.1.6 Ignition time
Equipped with CDI, there is no need for
ignition setting.
Check ignition system if ignition time is
incorrect.
Dismount right body cover.
Remove ignition timing inspection plus.
Check ignition timing, using timing light.
Crankcase mark must be aligned with mark
“F” on flywheel while engine is at idle speed.
The timing should advance as the RPM is
increased.
The timing mark should align with the
crankcase mark at 3000 RPM.
3.1.7 Cylinder pressure
Measure cylinder pressure with the engine
warmed up.
Remove spark plug
Install a cylinder pressure gauge.
With throttle fully open, start starter motor to
measure cylinder pressure.
Compression pressure:15kg/cm
2
-600rpm
If the pressure is excessively low, check for
following:
Valve leakage
Valve gap too tight
Cylinder head gasket damaged
Piston ring worn
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