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50-Hour Maintenance
Every 50 hours of operation
(more frequently in dusty or
dirty conditions):
n Remove and clean the cylinder cover
and clean dirt and debris from the cylin-
der cooling fins.
n Lubricate the gearcase. To perform
this operation, first remove the gearcase
from the outer tube as follows:
Gearcase
Clamp Bolt
Outer Tube
Gearcase
Index Bolt
Figure 21
CAUTION!
Do not remove the D-shaped shim
washer from the gearcase clamp! The
shim washer prevents damage from
overtightening the tube clamp screw.
a. Loosen the gearcase clamp bolt.
b. Remove the index bolt from the
gearcase.
139/150-Hour Maintenance
Maintenance after first 139-hours,
then every 150-hours thereafter.
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 resis-
tor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.04-0.08 inch (0.6 -0.7 mm).
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
Valve Adjustment
1. Remove cylinder cover, rocker arm
cover, and set piston at TDC-compresion.
CAUTION!
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the engine.
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, consult with an authorized
Shindaiwa servicing dealer.
c. Slide the gearcase out of the tube.
Using a grease gun, pump lithium-base
grease (about 10 grams) into the grease
fitting on the gearcase until you see old
grease being purged from the gearcase
(Figure ). Purged grease will be
visible in the outer tube cavity. Clean
up excess grease, then reassemble the
gearcase onto the outer tube. Make sure
the index bolt fits into the hole on the
outer tube. Securely tighten both bolts.
Figure 22
Servicing the fuel filter
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.
. Loosen adjuster locknut so that the .5
mm Allen socket head adjustment screw
can turn freely.
3. Insert feeler gauge (.004" for both intake
and exhaust) between valve stem tip and
rocker arm.
4. Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser)
until feeler gauge is almost snug. Back
n Use a wire hook to extract the fuel filter
from inside the fuel tank (Figure 3). In-
spect the fuel filter element. If it shows
signs of contamination from debris,
replace it with a genuine Shindaiwa
replacement fuel filter element. Before
reinstalling the filter, inspect the fuel
line. If you discover damage or deterio-
ration, the unit should be removed from
service until it can be inspected by a
Shindaiwa-trained service technician.
Gearcase
Grease Fitting
Hooked
Wire
Figure 23
off just enough to allow gauge to slip
out with limited resistance.
5. While holding adjustment screw in
place with Allen driver, tighten locknut
with wrench.
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 locknut. Readjust
as necessary.
7. Replace rocker arm cover gasket to as-
sure proper sealing and install cover.
If new gasket is not available and/or old
gasket is not damaged, old gasket may
be reused. Never use cracked or dam-
aged gaskets!
Filter Element
IMPORTANT!
13
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