Honda FF500 Manuel De L'utilisateur page 45

Spark plug service
Recommended spark plug: BPR5ES (NGK)
CAUTION:
Never use a spark plug with an improper heat range.
To ensure proper engine operation, the spark plug must be properly gapped and
free of deposits.
1. Disconnect the spark plug cap.
2. Remove the spark plug with spark plug wrench.
If the engine has been running, the muffler will be very hot. Be careful not
to touch the muffler.
SPARK PLUG CAP
SPARK PLUG WRENCH
3. 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
reused.
4. Measure the plug gap with a feeler gauge.
The gap should be:
0.7 – 0.8 mm(0.028 – 0.031 in)
Correct as necessary by bending the side
electrode.
42
SIDE ELECTRODE
0.7-0.8 mm
(0.028-0.031 in)