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Maintenance (continued)
50 hour maintenance
Remove and replace the fuel filter
element.
Use a hooked wire to extract the fuel filter
from inside the fuel tank. Inspect the fuel
filter element. If it shows signs of contami-
nation, replace with a genuine Shindaiwa
replacement fuel filter element.
CAUTION!
Make sure you do not pierce the fuel line
with the end of the hooked wire. The line
is delicate and can be damaged easily.
Before reinstalling the new filter element,
inspect the condition of all the fuel system
components (fuel pick-up line, fuel return
line, tank vent line, tank vent, fuel cap
and fuel tank). If damage, splitting or
deterioration is noted, the unit should
be removed from service until it can be
inspected or repaired by a Shindaiwa-
trained service technician.
139/150-Hour Maintenance
Maintenance after first 139-hours,
then ever y 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.
Valve adjustment
1.
Remove cylinder cover, rocker arm
cover, and spark plug. Rotate the
crankshaft while observing the pis-
ton through the spark plug open-
ing. When the piston is at the top of
the compression stroke (TDC), the
valves can be adjusted.
CAUTION!
Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the engine.
If you are unfamiliar with this
engine or uncomfortable with this
procedure, consult with an autho-
rized Shindaiwa servicing dealer.
All manuals and user guides at all-guides.com
Hooked wire
Replace the spark plug annually: Use
only NGK CMR5H or equivalent resis-
tor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.6 -0.7 mm (0.024-0.028 inch).
2.
Loosen adjuster locknut so that the
2.5 mm Allen socket head adjustment
screw can turn freely.
3.
Insert 0.10 mm (0.004") feeler gauge
between valve stem tip and rocker arm.
4.
Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser) until
feeler gauge is almost snug. Back off
just enough to allow gauge to slip out
with limited resistance.
5.
While holding the adjustment screw in
place with the Allen driver, tighten the
locknut with a wrench.
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance
(EMC).
6.
Turn engine over several times, and
return to TDC-compression. Recheck
with proper feeler gauge to make sure
clearance adjustment did not change as
a result of tightening the locknut. Read-
just as necessary.
7.
Replace rocker arm cover gasket to
assure proper sealing and install cover.
IMPORTANT!
If a new gasket is not available and/or the
old gasket is not damaged, the old gasket
may be reused. Never use cracked or dam-
aged gaskets!
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