8. Maintenance
IMPORTANT
• Notethatusinganysparkplugotherthanthosedes-
ignated may result in the engine failing to operate
properly or in the engine becoming overheated and
damaged.
• Toinstallthesparkplug,rstturnthepluguntilitis
finger tight, then tighten it a quarter turn more with a
socket wrench.
Tightning torque:
9.8~11.8N.m.
(1.0~1.2kgm)
■ GEAR CASE
• Thereductiongearsarelubricatedbymultipurpose,
lithium-based grease in the gear case. Supply new
grease every 25 hours of use or more often depend-
ing on the job condition.
• Removetheboltopposittothegreasenipplebefore
installing new grease to arrange for old grease to exit.
WARNING
Makesurethattheenginehasstoppedandiscool
beforeperforminganyservicetothemachine.Con-
tactwith moving cuttingheador hot mufermay
resultinapersonalinjury.
■ AIR FILTER
The air filter, if clogged, will reduce the engine perfor-
mance. Check and clean the filter element in warm,
soapy water as required. Dry completely before installing.
If the element is broken or shrunk, replace with a new
one.
(1) Air filter
■ FUEL FILTER
When the engine runs short of fuel supply, check the fuel
strainer for blockage.
(1) Fuel strainer
■ 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 replacement plug, use
the correct type specified by ZENOAH.
0.6~0.7mm
REPLACEMENT PLUG IS
A NGK BPMR7A.
GB-12
BC3450DW / BC4350DW
BC3450DW_4350DW_GB_cs5.indd 12 17/09/05 17:04