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[170BT] [180BT] (F26)
1. Unscrew 2 knob bolts and remove the air cleaner cover. Then remove the prefilter
mounted inside the air cleaner cover.
(1) Knob Bolt (2) Prefilter
(3) Inner Case [180BT] (4)Paper Filter
2. Wash the prefilter in fresh, non flammable cleaning solution (ex. warm soapy water)
and then dry.
(Clean the air filter once in a week.)
3. Exchange the paper filter element with new one in case it has been contaminated.
WARNING
• This prefilter is dry type.
• Never wash the prefilter in an oily cleaning solution.
• Never include oil in the wash.
• Do not clean the paper filter by tapping on it.
FUEL FILTER
• A clogged fuel filter may cause poor acceleration of the engine. Check periodically to
see if the filter is clogged with dirt. The filter can be taken out of the fueling port using
a small wire hook. Disconnect the filter assembly from the fuel pipe and unhook the
retainer to disassemble it. Clean the components with gasoline.
(1) Screen (2)Element (x 2)
(3) Holder (4)Retainer
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.
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: [130BT] [150BT] [170BT] [180BT]
7 to 11 N·m 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)
(1)
(2)
(3)
(4)
F26
[170BT] [180BT]
(180BT ONLY)
F27
F28
(2)
(1)
(2)
(4)
(3)
(2)
(4)
(3)
(1)
F30
F29
[150BT] [170BT] [180BT]
[130BT]
Maintenance