Engine Maintenance
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Spark plug
It is recommended to use spark plug,F7TC or equivalent one.
Spark plug of incorrect type may damage the engine.
1) Remove the spark plug cap，Clean dust around the spark plug.
2) Unscrew the spark plug with a special socket wrench.
3) Check spark plug. If the electrode has damaged, or isolator has broken, replace the
spark plug. The clearance of the spark plug electrode should be 0.70-0.80mm. Adjust
the side electrode, if necessary.
4) Screw the spark plug with hand carefully to avoid damaging the thread on the head.
5) When the spark plug is in position, tighten the spark plug with the special socket
wrench and depress the washer.
If install the used spark plug，after depressing the washer, retighten it 1/8-1/4 turn.
6) Reinstall the spark plug cap.
Regulate idle speed
1. Start the engine outdoor，warm up it for a while.
2. Put the regulation lever to “low” position.
3. Regulate the idle speed with a special tool，make
idle speed within the range:
Standard idle speed：1500±150rpm。
Caution
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