3. INSPECTION/ADJUSTMENT ATV 300/250
Cylinder Head Cover
VALVE CLEARANCE
Inspect and adjust valve clearance while
the engine is cold (below 35).
Remove the cylinder head cover. (See page
7-4)
Index Mark "T" Mark
Turn the flywheel clockwise so that the "T"
mark on the flywheel aligns with the index
mark on the right crankcase cover to bring
the round hole on the camshaft gear facing
up to the top dead center on the
compression stroke.
Inspect and adjust the valve clearance.
Valve Clearance: IN: 0.1 mm (0.004 in)
EX: 0.1 mm (0.004 in)
Loosen the lock nut and adjust by turning Valve Wrench
the adjusting nut
Special tool:
Tappet adjuster E012
· Check the valve clearance again after
the lock nut is tightened.
Round Hole
CARBURETOR IDLE SPEED
· The engine must be warm for accurate
idle speed inspection and adjustment.
Warm up the engine before this operation.
Start the engine and connect a tachometer.
Turn the throttle stop screw to obtain the
specified idle speed.
Idle Speed:
ATV 250: 1500100 rpm
ATV 300: 1600100rpm
When the engine misses or run erratic, Air Screw Throttle Stop Screw
adjust the air screw.
3-7
An excellent service and not too long too wait for the part to be delivered. I live in Germany and its not easy to get spare parts here. I hope not to need your services again but if I do I will have no hesitation in doing so. John W. Parmley 
4.7 / 5