Shindaiwa GP3410 Manual Del Operador página 12

Maintenance (continued)
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
CAUTION!
Performing a valve adjustment
incorrectly may cause hard start-
ing and/or can damage the engine.
If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, consult with an authorized
Shindaiwa servicing dealer.
. Remove cylinder cover, rocker arm cover,
and set piston at TDC-compression.
. Loosen adjuster locknut so that the
.5 mm Allen socket head adjustment
screw can turn freely.
Figure 16

. 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).
Figure 17
3. Insert .004" (0.0 mm) feeler gauge 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
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.
NOTE:
The NGK CMR5H also meets the
requirements for electro magnetic com-
pliance (EMC).
Figure 18
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. Re-adjust
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 gas-
ket may be reused. Never use cracked or
damaged gaskets!