Maintenance (continued)
139/150-Hour Maintenance
Maintenance after first | . Replace the spark plug annually: Use | |
then every | only NGK CMR5H or equivalent resis- | |
. Combustion chamber should be decar- | tor type spark plug of the correct heat | |
range. Set spark plug electrode gap to | ||
bonized, and the valve clearance should | ||
be adjusted. It is highly recommended | ||
| ||
that this is done by a |
| |
service technician. |
|
NOTE:
The NGK CMR5H also meets the requirements for electro magnetic com- pliance (EMC).
Valve Adjustment
CAUTION!
Performing a valve adjustment incorrectly may cause hard start- ing and/or can damage the engine. If you are unfamiliar with this engine or uncomfortable with this proce- dure, consult with an authorized Shindaiwa servicing dealer.
. Remove cylinder cover, rocker arm cover, and set piston at
. Loosen adjuster locknut so that the
2.5mm Allen socket head adjustment screw can turn freely.
Figure 16
Figure 17
3.Insert .004" (0.10 mm) feeler gauge for both intake and exhaust between valve stem tip and rocker arm.
4.Turn adjustment screw (clockwise = tighter,
5.While holding adjustment screw in place with Allen driver, tighten locknut with wrench.
Figure 18
6.Turn engine over several times, and return to
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 gas- ket may be reused. Never use cracked or damaged gaskets!
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