Honda Harmony HRB217TDA Owner's Manual page 39

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
SEALING
WASHER
0.028 ~ 0.031 in
(0.7 ~ 0.8 mm)
37