9. MAINTENANCE SPARK PLUG SERVICE
Recommended spark plugs: NGK BPRSES
ND 16EPR-U
CHAMPION RNl2Y
pEiEq Spark plugs of the wrong heat range can cause engine
damage.
For good performance, the spark plug must be properly gapped and free of
deposits.
1. Disconnect the spark plug cap, and remove any dirt from around the spark
plug area.
B Touching the engine or exhaust system while hot can cause
bums. Let the engine cool before servicing.
2. Remove the spark plug with a spark plug wrench.
3. Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator
is cracked or chipped. Clean the spark plug with a wire brush if you are
going to reuse it.
4. Measure the spark plug electrode gap with a feeler gauge. The gap should
be 0.024-0.028 in (0.6-0.7 mm). Correct the gap as necessary by carefully
bending the side electrode.
5. Install the spark plug carefully, by hand, to avoid cross-threading.
6. After the spark plug is seated, tighten with a spark plug wrench to compress
the washer.
[NoTlCEI A loose spark plug can get hot enough to damage the
engine. Overtightening may damage the threads.
NOTE: If installing a new spark plug, tighten l/2 turn after the spark plug
seats to compress the washer. If reinstalling a used spark plug, tighten
1 /B-l /4 turn after the spark plug seats. I
7.
Install the spark plug cap on the spark plug. pd.g?-;-;.O$, in.
SPARK PLUG CAP
38 SPARK PLUG WRENCH