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6.3.
MAINTENANCE OF SPARK PLUG
Note: Never use any spark plug with an incorrect heat range. In order to guarantee normal running of
the engine, the spark plug shall have an appropriate gap without deposit on it.
• Use a special socket spanner to detach the spark plug.
Special socket spanner for spark plug
Warning!
• If the engine has just stopped running, the muffler will be very hot. So keep clear of
hot temperature to avoid scald.
• Check the spark plug. If it is obviously worn or the insulation has any crack or
damage, please replace it, if it has too much carbon deposition; use a wire brush to
clean it.
• Use a clearance gauge to measure the spark plug gap, correct value of which shall
be 0.70 to 0.80mm.
• Check whether spark plug washer is good. In order to avoid thread alternating, use
hand to screw spark plug in first.
• After screwing spark plug to the bottom, use a special socket spanner to tighten it
and the washer below it.
Note: If the spark plug is a new one, tighten the spark plug further by 1/2 turn after the washer is
pressed down tightly.
If the spark plug has been used, tighten it further by 1/8 - 1/4 turn after the washer is pressed
down tightly.
The spark plug must be tightened adequately, or it will be heated and damage the engine.
Warning!
If the engine has just stopped running, the muffler will be very hot. Don't work on
the engine before it has cooled.
14
0.7-0.8mm
(0.028-0.031in)
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