What is the method for adjusting motorcycle valve clearance?

1 Answers
DiDaniela
07/30/25 5:17am
Motorcycle valve clearance adjustment method is as follows: 1. Adjustment for overhead camshaft valves: Remove the magneto cover and valve chamber cover, rotate the magneto rotor counterclockwise to align the "T" mark on its outer circumference with the mark on the engine casing. At this point, the piston should be at top dead center of the compression stroke. Then select a feeler gauge of specified thickness, insert it into the valve clearance and pull it back and forth. If slight resistance is felt, the clearance is appropriate. If there's no resistance, adjustment is needed. First use a small wrench to turn the adjustment screw while pulling the feeler gauge to sense resistance. Once the clearance is correct, tighten the adjustment nut. 2. Adjustment for side valve clearance: Side valve clearance refers to the gap between the valve stem end and the adjusting screw on the tappet. Remove the valve chamber cover and spark plug, then block the spark plug hole with your finger while stepping on the kick starter. When airflow impact is felt, the piston is in compression stroke. Insert a screwdriver into the spark plug hole and slowly step on the kick starter. When the screwdriver reaches its highest point, the piston is at top dead center. Then check and adjust the valve clearance using the same method as for overhead camshaft valve clearance inspection and adjustment.
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