16
135-Hour Maintenance
IMPORTANT!
If a new gasket is not available and/or the old gasket is not damaged, the old gasket may be reused. Never use cracked or
damaged gaskets!
7. Replace rocker arm cover gasket to assure proper sealing and install cover.
1. Remove cylinder cover, rocker arm cover, and spark plug. Rotate the
crankshaft while observing the piston through the spark plug opening.
When the piston is at the top of the compression stroke (TDC), the valves
can be adjusted.
2. Loosen adjuster locknut so that the 2.5 mm hex socket head adjustment
screw can turn freely.
3. Insert 0.10 mm (0.004 in.) feeler gauge between valve stem tip and rocker arm.
4. Turn adjustment screw
• clockwise = tighter
• counterclockwise = looser
until feeler gauge is almost snug. Back off just enough to allow gauge to slip
out with limited resistance.
5. While holding the adjustment screw in place with the hex driver, tighten the
locknut with a wrench.
6. Turn engine over several times, and return to TDC-compression. Recheck with
proper feeler gauge to make sure clearance adjustment did not change as a
result of tightening the locknut. Readjust as necessary.
CAUTION!
■
Performing a valve adjustment incorrectly may cause hard starting and/or can damage the engine.
■
If you are unfamiliar with this engine or uncomfortable with this procedure, consult with an authorized Shindaiwa
servicing dealer.
Valve Adjustment
IMPORTANT!
The valve clearance should be adjusted. It is highly recommended that this is done by a Shindaiwa-trained service
technician.
Maintenance (continued)
Summary of Contents for T254
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