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■ 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. Check that the spark plug is fitted with a suppressor.
• 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.
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 the bolts (2).
Fastening Torque: 8 to 12 N·m
• Also make sure that the spark arrester and the diffuser are properly attached
with the bolts (1). (Fastening Torque : 2 to 3 N·m)
■ COOLING SYSTEM
• To keep the working temperature as low as possible the machine is equipped
with a cooling system.
(1) Cooling fins on the cylinder.
• Clean the cooling system with a brush once a week, more often in
demanding conditions. A dirty or blocked cooling system results in the machine
overheating which causes damage to the piston and cylinder.
F16
F17
F18
(1)
F19
Maintenance
BB2250_English.fm Page 16 Thursday, December 10, 2009 1:35 PM