Firman H07553, Operator'S Manual, Page: 29 / 45

English Customer Service: 1-844-FIRMAN1
( c) Inspect spark plug for damage and clean with a wire brush before reinstalling. Replace if
damaged.
Maintenance Valve Clearance
-
Intake
:
0
.
004
-
0
.
006 in
. (
0
.
1
-
0
.
15 mm
)
-
Exhaust
:
0
.
004
-
0
.
006 in
. (
0
.
1
-
0
.
15 mm
)
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.
28
Maintenance - Storage
SPARK PLUG: FIRMAN P/N 330723001 or CHAMPION N9YC
(d-1) For spark plug FIRMAN P/N 330723001 - Adjust the electrode gap to 0.020 - 0.024 in. ( 0.5 - 0.6 mm).
(d-2) For spark plug CHAMPION N9YC - Adjust the electrode gap to 0.028 - 0.031 in. ( 0.7 - 0.8 mm).
(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.
0.020-0.024 in.
(0.5-0.6mm)
0.028-0.031 in.
(0.7-0.8mm)
SPARK PLUG: FIRMAN P/N 330723001 SPARK PLUG: CHAMPION N9YC