Honda BF75 Owner's Manual page 31

Spark Plug Service
Recommended spark plug: DR-5HS (NGK), XlGFSR-U (ND)
1. Remove the engine cover.
2. Remove the spark plug cap.
3. Use the wrench supplied in the tool kit to remove the spark plug.
4. Visually inspect the spark plug. Discard it if the insulator is cracked or chip-
ped. Clean the spark plug with a wire brush if it is to be reused.
5. Measure the plug gap with a feeler gauge.
The gap should be 0.6-0.7 mm (0.024-0.028 in). Correct as necessary by
bending the side electrode.
6. Attach the plug washer. Thread the plug in by hand to prevent
cross-threading.
7. Tighten a new spark plug l/2 turn with the wrench to compress the washer.
If you are reusing a plug, it should only take l/8-1/4 turn after the plug
seats.
8. Reinstall the engine cover.
CAUTION:
l
The spark plug must be securely tightened. An improperly tightened plug
can become very hot and possibly damage the engine.
l
Never use a spark plug with an improper heat range.
/
WRENCH+
PLUG GAP
0.6-0.7 mm
(0.024-0.028
in)
29