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Wide valve clearance may produce noise Narrow valve clearance may harm to valve turning off which lead to ablation or low
power efficiency, in this case periodic checking for valve clearance is needed. Engine passed StateIII, whose valve is fine
processed, which ensured reasonable valve clearance.
Checking and adjustment of valve clearance should be under the status of cold engine:
1. Remove center hole cap and top cap(Ignition observation hole) one left crankcase cover
2. Remove valve cap or cylinder cover on cylinder head.
3. Insert T typed spanner into center hole on case cover , and seizing-up nut on fly-wheel, turn the fly-wheel clockwise,
untill the “T” on fly wheel alined with scale line on top of case. Slightly shake the swing arm, in case it is flexible (with
clearance), which indicates piston is at the upper stopping point of compression stroke, in case the swing arm is tight, which
means piston is at the lower point of exhaust stroke, and then, continue turn T spanner for 360 degree clockwise, aline the
scale line, and then the valve is adjustable.
Insert feeler gauge between valve end and its adjustment screw, check the clearance of
valve Standard valve clearance: Please refer to main technological parameters.
4. In case adjustment is needed loosen the valve fastening nut, adjust the screw, untill
feeler gauge met slight resistance when insert in.
5. Waste gas from crankcase enter air filter without direct entry to atmosphere.
6 Motorcycle with negative pressure tube, whose oil returning cut off air supplying for
preventing air reverse flow.
When adjustment finished screw up fastening nut for preventing flexibility, check again
valve clearance install valve cap(or cylinder cover) and 2 holes on left crankcase.
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Checking and adjustment of valves clearance
21
Cylinder cover
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