Owner's anual
Maintenance
Spark Plug Service
In order to service the spark plug, you will need a spark plug wrench (commercially available).
Recommended spark plugs: NHSP LD F7TC or Champion N9YC
To ensure proper engine operation, the spark plug must be properly gapped and free of debri
deposits.
,_ WARNING
If the engine has been running, the muffler will be very hot. Be careful not to touch the muffler.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench to
remove the spark plug.
4. 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.
5. Measure the plug gap with a feeler gauge.
Correct as necessary by carefully bending
the side electrode.
PLUG CAP
The gap should be: 0.70-0.80 mm (0.028-0.031 in)
6. Check that the spark plug washer is in good condition, and thread the
spark plug in by hand to prevent cross-threading.
7. After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
If installing a new spark plug, tighten 1/2 turn after the spark plug seats to
compress the washer. If reinstalling a used spark plug, tighten 1/8-1/4
turn after the spark plug seats to compress the washer.
'% SPARK PLUG WRENCH
(.028-.031 in)
! _(.70-.80 mm)
_NOTE
The spark plug must be securely tightened. An improperly tightened spark plug can become
very hot and could damage the engine. Never use spark plugs which have an improper heat
range. Use only the recommended spark plugs or equivalent.
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