Honda FR750, Owner'S Manual

Page: 40 / 62

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37
Spark plug service
Recommended spark plug:
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
The spark plug must be securely tightened. An improperly
tightened plug can become very hot and possibly damage the
engine.
Never use a spark plug with an improper heat range.
SPARK PLUG WRENCH
0.7 0.8 mm (0.028 0.031 in)
BPR5ES (NGK) W16EPR-U (DENSO)
0.7 0.8 mm (0.028 0.031 in)
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
Measure the plug gap with a feeler gauge.
Correct as necessary by bending the side electrode.
The gap should be:
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.
Open the engine upper cover
(refer to page 35) and take off the
spark plug cap.
Remove the spark plug with a
spark plug wrench.
After seating it by hand, tighten a new spark plug 1/2 turn with the
wrench to compress the washer. If you are reusing a plug, it should
only take 1/8
1/4 turn.
Check that the spark plug washer is in good condition and thread
the spark plug in by hand to prevent cross-threading.
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