Counter-clockwise
to remove.
Clean the spark
plug and check
the gap at the
electrode.

Fuel Tank

139/150-Hour Maintenance

Fuel
Filter
Hooked
Wire
spark plug gap--all models
0,6 - 0,7 mm
(0.024 in.)
Figure 22
Figure 23
NGK CMR5H
14
INSPECTION Inspect the entire ■blower and tubes for damage, includ-
ing loose or missing components, and
repair as necessary.
(more frequently if reduced performance
is noted)
Inspect the filter element for signs of ■contamination from debris. A contami-
nated fuel filter should be replaced with
a new Shindaiwa replacement element.
Before reinstalling the filter, inspect the
condition of the fuel line. If you note
damage or deterioration, the blower
should be removed from service until
it can be inspected by a Shindaiwa-
trained service technician.
COOLING SYSTEM Use a wood or

■plastic scraper and a soft brush to

remove dirt and debris from the cylin-
der fins and crankcase.

Every 50 Hours

Every 10/15 Hours

CAUTION!
Never allow dirt or debris to enter the
cylinder bore! Before removing the
spark plug, thoroughly clean the spark
plug and cylinder head area!
Allow the engine to cool before serv-
icing the spark plug! Cylinder threads
can be damaged by tightening or loos-
ening the spark plug while the engine
is hot!
CAUTION!
Make sure you do not pierce the fuel
line with the end of the hooked wire.
The line is delicate and can be dam-
aged easily.
FUEL FILTER Use a hooked wire to ■extract the fuel filter from inside the
fuel tank.
Maintenance
Use the spark plug wrench to remove 1. the spark plug.
Clean and adjust the spark plug gap
2. to 0.6mm (0.024”). If the plug must be
replaced, use a NGK CMR5H or equiva-
lent type plug of the correct heat range.
Install the spark plug finger-tight
3. in the cylinder head, then tighten it
firmly with the spark plug wrench. If a
torque wrench is available, torque the
spark plug to 16.7-18.6 Nm (148-165
inch- pounds).
SPARK PLUG Replace the spark plug

■with a NGK CMR5H (or equivalent),

gapped to 0.6 mm (0.024”).
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
Replace the spark plug annually: Use ■onlyNGK CMR5H or equivalent resis-
tor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.6 mm (0.024 inch).
Maintenance after first 139-hours,
then every 150-hours thereafter.
Combustion chamber should be decar-

■bonized, and the valve clearance should

be adjusted. It is highly recommended
that this is done by a Shindaiwa-trained
service technician.