Shindaiwa M254 manual Hour Maintenance, Valve adjustment, Maintenance continued

Maintenance (continued)

135-Hour Maintenance

■■Combustion chamber should be decarbonized, and the valve clear- ance should be adjusted. It is highly recommended that this is done

by a Shindaiwa-trained service technician.

■■Replace the spark plug annually: Use only the type recommended in the ”Specifications” section or an equivalent resistor type spark plug of the correct heat range. Set spark plug electrode gap to 0.6 mm.

Valve adjustment

1.Remove cylinder cover, rocker arm cover, and spark plug. Rotate the crankshaft while observing the pis- ton through the spark plug open- ing. When the piston is at the top of the compression stroke (TDC), the valves can be adjusted.

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.

2.Loosen adjuster locknut so that the

2.5 mm Allen socket head adjustment screw can turn freely.

3.Insert 0.10 mm (0.004”) feeler gauge between valve stem tip and rocker arm.

4.Turn adjustment screw (clockwise = tighter, counter-clockwise = 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 Allen 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.

7.Replace rocker arm cover gasket to assure proper sealing and install cover.

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!

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