Filter
Top Products
15
139/150-Hour Maintenance
Maintenance after rst 139-hours,
then every 150-hours thereafter.
n Combustion chamber should be
decarbonized, 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
0.024-0.028 inch (0.6 -0.7 mm).
Spark Arrester Screen Maintenance
If the engine becomes sluggish and low on
power, check and clean the spark arrester
screen.
Never operate the unit with a damage
or missing mufer or spark arrester!
Operating with a missing or damaged
spark arrester is a re hazard and
could also damage your hearing.
3. With a small flat bladed screwdriver
remove the 2 screws holding the spark
arrester screen and cover to the muffler.
See Figure 32.
4. Remove the screen and clean it with a
stiff bristle brush.
5. Inspect the cylinder exhaust port for any
carbon buildup.
6. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
IMPORTANT!
If you note excessive carbon buildup, consult
with an authorized Shindaiwa servicing dealer.
WARNING!
1. With a 3 mm hex wrench remove the
4 engine cover screws and the engine
cover. See Figure 32.
2. With a 4 mm hex wrench remove the
3 muffler bolts and the muffler. See
Figure 32.
Engine Cover
Screws
Engine
Cover
Mufer
Mufer
Gasket
Mufer
Bolts
Spark Arrester
Screen
Spark Arrester
Cover
Cover
Screws
Valve Adjustment
1.
Remove cylinder cover, rocker arm cover,
and set piston at TDC-compresion.
2. Loosen adjuster locknut so that the 2.5
mm Allen socket head adjustment screw
can turn freely.
3. Insert feeler gauge (.003 for intake; .004
for exhaust) between valve stem tip and
rocker arm.
4. Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser) until
feeler gauge is almost snug. Back off
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
assure proper sealing and install cover.
IMPORTANT!
If new gasket is not available and/or old
gasket is not damaged, old gasket may be
reused. Never use cracked or damaged
gaskets!
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 procedure, consult with an
authorized Shindaiwa servicing
dealer.
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.
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
Figure 32