23
Fig.17 Disconnection of spark plug
3. Use the wrench to remove the spark plug.
4. Clean any dirt from around the spark plug base.
5. Visually inspect the spark plug. Discard it if the insulator is cracked or chipped.
Clean the spark plug with a wire brush if it is to be reused.
6. Measure the plug gap with a feeler gauge.
The gap should be 0.5-0.75mm (0.02-0.03in). Correct as necessary by carefully
bending the side electrode.
Fig. 18 Gap measurement of plug gap
CAUTION
■ The spark plug must be securely tightened. An improperly tightened plug can
become very hot and possibly damage the generator.
■ Never use a spark plug with an improper heat range.
7. Install the spark plug carefully, by hand, to avoid cross-threading.
8. After a new spark plug has been seated by hand, it should be tightened 1/2 turn
with a wrench to compress its washer.
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