CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 12
Spark plug gap :
0.6-0.7 mm
6. Install:
zSpark plug
NOTE:
Before installing a spark plug, clean the
Gasket surface and plug surface.
3.2.4COMPRESSION PRESSURE
MEASUREMENT
NOTE :
Insufficient compression pressure will result in
performance loss.
1. Check:
zValve clearance
Out of specification Adjust.
Refer to “CALCE CLEARANCE ADJUSTMENT”
section.
2. Start the engine and let it warm up for several
minutes.
3. Turn off the engine.
4. Remove:
zSpark plug
Before removing the spark plug, use com
pressed air to blow away any dirt accumulated
in the spark plug well to prevent it from falling
into the cylinder.
5. Attach:
zCompression gaugec
6. Measure:
zCompression pressure
If it exceeds the maximum pressure allowed→
Inspect the cylinder head, valve surfaces and
piston crown for carbon deposits.
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