( c) Inspect spark plug for damage and clean with a wire brush before reinstalling. Replace if
damaged.
(d)
Adjust the electrode gap to 0.7 to 0.8 mm (0.028” to 0.031”).
(e)
Seat spark plug in position and thread by hand to prevent cross threading.
(f)
Tighten plug with provided wrench and put the spark plug boot back on spark plug.
SPARK PLUG: FIRMAN P/N 330723001 or CHAMPION N9YC
Maintenance Valve Clearance
Intake: 0.13
–
0.17 mm (0.005
–
0.007 i n.)
Exhaust: 0.18
–
0.22 mm (0.007
–
0.009 in.)
NOTICE
Tech bulletin regarding the valve adjustment procedure is on
www.firmanpowerequipment.com.
Muffler and Spark Arrester
WARNING!
Contact with muffler area could cause burns resulting in serious injury.
Do not tough hot parts.
It is a violation of California Public Resource Code, Section 4442, to use or operate the engine
on any forest-covered, brush-covered, or grass-covered land unless the exhaust system is
equipped with a spark arrester, as defined in Section 4442, maintained in effective working
order. Other states or federal jurisdictions may have similar laws, reference Federal
Regulation 36 CFR Part 261.52.
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