Proper spark plug clearance and without deposit around the spark plug ensure the engine’s normal running.
1) Remove the spark plug by means of spark plug wrench. (Pic. 20)
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!
WARNING
Be careful not to touch the muffler during or just after running the engine.
2) Clean the spark plug with a steel brush. If the insulator is damaged, replace the spark plug instead.
3) Measure the spark plug clearance with a feeler. The clearance should be 0.7～0.8mm,If adjustment is necessary,
bend the side electrode carefully. (Pic. 21)
4) Check if the spark plug gasket is in good conditions, or replace with a new one.
5) Screw on the spark plug to the bottom first by hand and then tighten it up by a spark plug wrench.
(Pic. 22)
If a new spark plug is used, twist 1/2 more turns after impacting the gasket; if reinstall the original
one, just twist 1/8～1/4 more turns.
(Pic. 21) (Pic. 22)
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