Shindaiwa 81719 Benutzerhandbuch

1

The metal gearcase protector (p/n 7958-

1610) is installed to protect the gearcase 

flange from damage when working close to 

sidewalks or other abrasive surfaces, and 

should be routinely inspected for damage 

or excessive wear. 
When replacing the protector, inspect to be 

sure that both of the protector mounting 

screws are firmly tightened and each screw 

is locked in place with a nut as shown.

CAUTION!
The D-shaped shim washer must be 

positioned with its flat edge toward the 
shaft tube.

26024   

139/150-Hour Maintenance



  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).

The NGK CMR5H also meets the requirements 

for electro magnetic compliance (EMC). 

1.  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 feeler gauge .004” (0.10 mm) 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. 

7.  Replace rocker arm cover gasket to as-

sure proper sealing and install cover. 

IMPORTANT!

If new gasket is not available and/or old 

gasket is not damaged, old gasket may be re-

used. Never use cracked or damaged gaskets! 

  CAUTION!
  Performing a valve adjustment incor- 

rectly may cause hard starting and/or  
can damage the engine.

  If you are unfamiliar with this engine 

or uncomfortable with this procedure, 
consult with an authorized Shindaiwa 
servicing dealer. 

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. 

50-Hour Maintenance (continued)