G120F/G160F/G200F Part III Maintenance
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3-7 Spark plug
Recommended types: F7RTC or equivalent types.
Spark plugs of the wrong type can lower engine
performance and cause engine damage
1) Remove the spark plug cap.
2) Remove the spark plug with a spark plug wrench.
3) Visually inspect whether the insulator is cracked or
chipped, if so, replace it with a new one, if there are
excessive deposits on it; clean it with a wire brush.
4) Measure the electrode gap with a feeler gauge. The
correct gap is 0.70-0.80mm (0.028 - 031 in). If necessary,
adjust the gap by carefully tapping tapping (for a too big gap) the electrode or gently forcing up
(for a too small gap) the electrode using a slotted
screwdriver.
5) Make sure the spark plug’s sealing washer is in a good
condition.
6) Install the spark plug and use a spark plug wrench
to tighten it into the cylinder head.
7) When installing the spark plug, in order to prevent
cross-threading, first use hand to screw it in the
direction as shown by the arrow to install it into the tapped hole in the cylinder head, then
tighten with a plug wrench to compress the sealing washer.
8) If installing a new spark plug, tighten 1/2 turn after the
spark plug seats.
9) If reinstalling the used spark plug, tighten 1/8-1/4
turn after the spark plug seats.
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