Honda HRC216HXA Owner's Manual page 41

2. Remove the spark plug with a
13/16 in (21 mm) spark plug
wrench.
3. Inspect the spark plug.
Replace it if the electrodes are
worn, or if the insulator is
cracked or chipped.
4. Measure the spark plug
electrode gap with a suitable
gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8 mm). Correct
the gap, if necessary, by carefully bending the side electrode.
5. Install the spark plug carefully,
by hand, to avoid
cross-threading.
6. After the spark plug seats,
tighten with a 13/16 in (21 mm)
spark plug wrench to compress
the washer.
If reinstalling the old spark plug,
tighten 1/8 to 1/4 turn after the
spark plug seats.
If installing a new spark plug,
tighten 1/2 turn after the spark
plug seats to compress the washer.
NOTICE
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.
7. Install the spark plug cap on the spark plug.
SERVICING YOUR LAWN MOWER
0.028 ~ 0.031 in
(0.7 ~ 0.8 mm)
SPARK PLUG
WRENCH
SEALING
WASHER
39