Motorcycle Valve Clearance Adjustment Method

[LaPeyton]

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 the specified thickness and insert it into the valve clearance. If slight resistance is felt when pulling the gauge back and forth, the clearance is appropriate. If no resistance is felt, adjustment is needed. First, use a small wrench to turn the adjustment screw while pulling the feeler gauge to sense the 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 adjustment screw on the tappet. Remove the valve chamber cover and spark plug, then block the spark plug hole with your finger. Step on the kick starter until you feel air pressure, indicating the piston is in the compression stroke. Insert a screwdriver into the spark plug hole and slowly press 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 adjustment.