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15
135-Hour or Annual Maintenance
The valve clearance should be adjusted
annually or every 135 hours. It is highly
recommended that this is done by a
Shindaiwa-trained service technician.
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).
NOTE:
The NGK CMR5H also meets the
requirements for electro magnetic
compliance (EMC).
Spark Arrester Screen Maintenance
If the engine becomes sluggish and low on
power, check and clean the spark arrester
screen.
WARNING!
Never operate this trimmer
with a damaged or missing muffler or
spark arrester! Operating with missing
or damaged exhaust components is
a fire hazard, and can also damage
your hearing!
1. With a 3 mm hex wrench remove the
4 engine cover screws and the engine
cover. See Figure 32.
2. With a small flat bladed screwdriver
remove the 2 screws holding the spark
arrester screen and cover to the muffler.
See Figure 32.
3. Remove the screen and clean it with a
stiff bristle brush.
Exhaust Port Inspection
4. With a 4 mm hex wrench remove the 3
muffler bolts and the muffler.
See Figure 32.
5. Inspect the cylinder exhaust port for any
carbon buildup.
IMPORTANT!
If you note excessive carbon buildup,
consult with an authorized Shindaiwa
servicing dealer.
6. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
Figure 32
Muffler
Bolts
Spark Arrester
Screen
Cover
Cover Screws
Muffler
Gasket
Engine Cover
Screws
Muffler
Spark Arrester
Cover
Valve Adjustment
1. Remove cylinder cover, rocker
arm cover, and set piston at TDC-
compression.
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.
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!
Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the unit. Refer to
the C-4 Service Manual for complete
valve adjustment procedure and
torque specifications.
If you are unfamiliar with this
engine or uncomfortable with
this procedure, Consult with an
authorized Shindaiwa servicing
dealer.
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 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.