Tomberlin CrossFire 150 - Valve Clearance Inspection

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VALVE CLEARANCE INSPECTION

Note: Inspection and adjustment of the valves must be done when the engine is cold. Suggested temperature is

below 95° F / 35° C.

• Remove the cylinder head cover. Take care not to damage the O-ring gasket. If damaged, the gasket must be

replaced with a new gasket.

• Unfasten the fan cover by unscrewing the 4 six mm bolts. Remove the fan cover.

• Turn the crankshaft so that the “T” mark on the ﬂ ywheel lines up with the corresponding mark on the

engine case. Timing marks on the cam sprocket must be aligned with the cylinder head surface. Cam lobes

must be pointing downward.

Cam timing

• Loosen the lock nuts on tappet screws to adjust valves.

• To adjust the valves use a valve adjusting wrench.

• To decrease valve clearance: turn tappet screw clockwise.

• To increase valve clearance: turn tappet screw counterclockwise.

• Use a thickness gauge to measure the valve clearance to 0.003 ~ 0.005 in.

• Take out the thickness gauge, tighten the lock nuts, and inspect the valve clearance to ensure that it falls

within the range of compliance.

Valve clearance:

Intake & Exhaust Valve clearance 0.003 ~ 0.005 in.

Note: Tightening the lock nuts may affect the amount of valve clearance. Readjust as necessary.