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15
SPARK PLUG
• The spark plug may gather carbon deposits on its firing end with reasonable use.
Remove and inspect the spark plug every 25 hours and clean the electrodes as
necessary with a wire brush. The spark gap should be adjusted to .025 in (0.6 to
0.7mm).
• Plug manufacturers recommend replacing the plug twice a year to avoid unexpected
plug failure in a job.
REPLACEMENT PLUG IS A NGK CMR7H.
IMPORTANT
• Note that using any spark plugs other than those designated may result in the
engine failing to operate properly or in the engine becoming overheated and
damaged.
• To install the spark plug, first turn the plug with your hands until it is tight, then
tighten it a quarter turn more with a socket wrench.
MUFFLER
WARNING
• Periodically inspect the muffler for loose fasteners, damage or corrosion. If
any sign of exhaust leakage is found, do not use the blower and have it
repaired immediately.
• Note that failing to do so may result in the engine catching on fire.
1. Remove the muffler, insert a screwdriver into the vent, and wipe away any carbon
buildup. Wipe away any carbon buildup on the muffler exhaust vent and cylinder
exhaust port at the same time.
2. Tighten all screws, bolts, and fittings.
SPARK ARRESTER
• The muffler is equipped with a spark arrester to prevent red hot carbon from flying
out of the exhaust outlet. Periodically inspect and clean as necessary with a wire
brush.
(1) Bolt (2)Bolt
(3) Spark Arrester (4) Diffuser
WARNING
• Before starting operation, always make sure to check if the muffler is properly
held by three bolts (F21 (2)). (Fastening Torque : 8 to 12 N·m)
• Also make sure that the speak arrester and the diffuser are properly attached
with four bolts (F21 (1)). (Fastening Torque : 2 to 3 N·m)
• Even if one of seven bolts is loose, it may result in engine catching on fire.
AIR INLET NET
IMPORTANT
• Blown air is taken in from the air inlet net. If the air flow drops during opera-
tion, stop the engine and inspect the air inlet net for blockage by obstacles.
• Note that failure to remove any such obstacles may result in the engine
becoming overheated and damaged.
(1) Net
WARNING
Never use the blower without the net on the blower. Before each use, check that
the net is attached in place and is free from any damage.
F20
(2)
(1)
(2)
(4)
(3)
F21
(1)
F22
Maintenance