Honda HRZ216TDA Harmony II Owner's Manual page 39

Spark Plug Service
Recommended spark plugs: BPR6ES (NGK) or W20EPR-U (DENSO)
For good performance, the spark plug must be properly gapped and
free of deposits.
NOTICE
An incorrect spark plug can cause
engine damage.
1. Disconnect the spark plug cap
and remove dirt from the area.
2. Remove the spark plug with a
spark plug wrench.
3. Inspect the plug; replace it if the
electrodes are worn, or if the
insulator is cracked or chipped
4. Set the gap to 0.028 ~ 0.031 in
(0.7 ~ 0.8 mm).
5. Install the spark plug carefully, by
hand, to avoid cross-threading.
6. After the plug seats, tighten it as
follows to compress the washer:
Old plug: 1/8 to 1/4 turn
New plug: 1/2 turn
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 MOWER
SPARK
PLUG
SPARK PLUG WRENCH
0.028 ~ 0.031 in
(0.7 ~ 0.8 mm)
SEALING
WASHER
SPARK PLUG CAP
37