17
3-6 Valve clearance adjustment
Keep the clearance between engine valve rod end and driving parts for avoiding heat expanding and
cold shrinking to effect engine performance.
If the valve is too big, it can result in exhausting unsmooth, effecting engine performance and
increasing engine noise (valve abnormal), if the valve is too small, the valve will close untighten to
make the engine operating abnormal and drain valve operating face burn.
After operating one year or 300h, check and adjust the valve.
(1) Dismount the spark plug cap, spark plug, cylinder head cover bolt, cylinder head cover and gasket in
order.
CAUTION:
After the cylinder head cover is removed, engine oil may flow. Be sure to wipe up any flowed oil.
(2) Lightly pull the starting rope and set the piston at top dead
center of the compression stroke (insert screwdriver into the
hole of the spark plug hole to check the height of piston.)
(3) Measure the valve clearance： Insert the feeler into the
clearance to measure clearance.
Adjust if the valve clearance is out of the service limit.
CAUTION:
Measure the valve clearance in the cold the engine state.
Valve clearance
IN：0.10-0.15mm
EX：0.15-0.20mm
Dowel Φ10×14
Cylinder head gasket
Stud M6×105
Stud M6×109
Spark plug
Cylinder head assy.
Bolt
Cover gasket
Head cover
Bolt M6×80
Bolt M6×12
Feeler
Screwdriver
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