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n INSPECTION Inspect the entire blower
and tubes for damage, including loose
or missing components, and repair as
necessary.
n SPARK PLUG Replace the spark plug
with a NGK CMR5H (or equivalent),
gapped to 0.6mm (0.024 in.).
n FUEL FILTER Use a hooked wire to
extract the fuel filter from inside the fuel
tank. See Figure 15.
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.
(more frequently if reduced
performance is noted)
n 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.
n COOLING SYSTEM Use a wood or
plastic scraper and a soft brush to
remove dirt and debris from the cylinder
fins and crankcase.
Fuel
Filter
Fuel Tank
Hooked
Wire
Every 50 Hours
Figure 15
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 servic-
ing the spark plug! Cylinder threads
can be damaged by tightening or loos-
ening the spark plug while the engine
is hot!
0.6mm
(0.024 in.)
Clean the spark plug
and check the gap
at the electrode.
Figure 14
NGK CMR5H
Counter-
clockwise
to remove.
1. Use the spark plug wrench to remove
the spark plug. See Figure 14.
2. Clean and adjust the spark plug gap
to 0.6mm (0.024 in.). If the plug must be
replaced, use a NGK CMR5H or equiva-
lent type plug of the correct
heat range.
3. Install the spark plug finger-tight 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)
139/150-Hour Maintenance
n 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.
n Replace the spark plug annually: Use
only NGK CMR5H or equivalent
resistor type spark plug of the correct
heat range. Set spark plug electrode gap
to 0.6mm (0.024 in.).
NOTE:
The NGK CMR5H also meets the
requirements for electro magnetic
compliance (EMC).
Maintenance after rst
139-hours, then every 150-hours
thereafter.
Valve Adjustment
1.
Remove cylinder cover, rocker arm cover,
and set piston at TDC-compression.
CAUTION!
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the unit. Refer
to the C-4 Service Manual for com-
plete valve adjustment procedure
and torque specications.
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, consult with an authorized
Shindaiwa servicing dealer.
2. Loosen adjuster locknut so that the 2.5
mm Allen socket head adjustment screw
can turn freely.