Zenoah BC251 Owner's Manual page 14

BC251
9. Maintenance 9. Maintenance
WARNING
• Make sure that the engine has stopped and is cool
before performing any service to the machine.
Contact with moving cutting head or hot muffler
may result in a personal injury.
AIR FILTER
• The air filter, if clogged, will reduce the engine per-
formance. Check and clean the filter element in warm,
soapy water as required. Dry completely before in-
stalling. If the element is broken or shrunk, replace
with a new one.
(1)
FUEL FILTER
• When the engine runs short of fuel supply, check the
fuel cap and the fuel filter for blockage.
SPARK PLUG
• Starting failure and misfiring are often caused by a
fouled spark plug. Clean the spark plug and check
that the plug gap is in the correct range. For a re-
placement plug, use the correct type specified by
ZENOAH.
• When you take off the spark plug, twist (1) and pull off
the cap (2).
0.6~0.7 mm
• REPLACEMENT PLUG IS A NGK BPMR7A.
GB-14
• Note that using any spark plug other than those des-
• To install the spark plug, first turn the plug until it is
MUFFLER
• Inspect periodically, the muffler for loose fasten-
(1) Air filter
• Note that failing to do so may result in the engine
SPARK ARRESTER
• The muffler is equipped with a spark arrester to pre-
(1) Fuel filter
IMPORTANT
ignated may result in the engine failing to operate prop-
erly or in the engine becoming overheated and dam-
aged.
finger tight, then tighten it a quarter turn more with a
socket wrench.
TIGHTENING TORQUE:
WARNING
ers, any damage or corrosion. If any sign of ex-
haust leakage is found, stop using the machine
and have it repaired immediately.
catching on fire.
vent red hot carbon from flying out of the exhaust out-
let. Periodically inspect and clean as necessary with
a wire brush.
9.8 ~ 11.8 Nm
(1 ~ 1.2 Kg.m)
(1)
(1) Spark arrester