Shindaiwa GP3410 Owner's Manual



Maintenance  (continued)

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.

.

.

Insert .004" (0.0 mm) feeler gauge for 

both intake and exhaust between valve 

stem tip and rocker arm.
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.
While holding adjustment screw in 

place with Allen driver, tighten locknut 

with wrench.

3.

4.

5.

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.
Replace rocker arm cover gasket to 

assure proper sealing and install cover.

6.

7.

 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.

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.

.

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 
requirements for electro magnetic com-
pliance (EMC).

139/150-Hour Maintenance

Valve Adjustment

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!