CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 9
3.2 PARTS INSPECTION AND SERVICE
3.2.1VALVE CLEARANCE ADJUSTMENT
NOTE:
Valve clearance adjustment should be made
with the engine cool, at room temperature.
When the valve clearance is to be measured or
adjusted, the piston must be at Top Dead Center
(T.D.C.) on the compression.
1. Remove :
zCrankcase cover
2. Remove :
zSpark plug
z Valve cover (intake side)
zValve cover (exhaust side)
3. Remove:
zTiming check plug
4.Measure:
zValve clearance
Out of specification → Adjust.
Valve clearance (cold):
260 / 300: Intake valve 0.08- 0.12m m
Exhaust valve 0.16- 0 .20mm
400: Intake valve 0.08- 0.12m m
Exhaust valve 0.13- 0.16mm
Measurement steps:
zRotate the primary fixed sheave
counterclockwise to align the slit “a”
on the rotor
with the stationary pointer “b” on the crankcover
1 when the piston is Top Dead Center (TDC).
zMeasure the valve clearance by using a feeler
gauge.
6. Adjust
zValve clearance
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