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Clean
/ Replace Spark Plug
Replace the spark plug yearly or every 100 hours of
operation,whichever comes first.
CAUTION: Disconnectspark plug wire from
,_
spark plug and keep wire away
spark plug.
from
Clean area aroundspark plug.
•
Remove spark plug form the cylinderhead.
•
Replace spark plug if the electrodesare pitted,
burnedor porcelain is cracked. For replacement
use Champion RC12YC or equivalent.
•
Check electrode gap with wire feeler gauge and set
gap to 0.76ram (.030 inches), if necessary.
•
install a correctlygapped spark plug intothe
cylinderhead, tighten secure|y.
\
Carburetor
If you thinkyour carburetor needs adjusting,see your
nearest Sears Service Center. Engine performance
may be affected at altitudesabove 5000 feet. For
operationat higher elevations,contactyour nearest
Sears Service Center.
Adjusting
Valve Clearance
After the firstfilly (50) hours of operation,you should
adjust the valve clearance in the engine.
Important: If you feel uncomfortableaboutdoing this
procedure or you don't have the propertools, please
take yourcleaning system in to the nearest service
center to have the valve clearance adjusted. This is a
very importantstep to insure the longest life for your
engine.
To adjustvalve clearance:
•
Make sure the engine is at roomtemperature.
•
Make sure that the spark plug wire is removed from
the spark plug and out of the way.
•
Remove the breather tube from the valve cover.
Remove the four s_rews attaching the valve cover
with a #2 or 3 phillipsscrewdriver.
O
Valve Cover
Breather Tube
Make sure the piston is at Top Dead Cer_ter('rDC)
of its compressionstroke (both valves closed). To
get the piston at top dead center, pull on the recoil
handle slowly watching the pistontrough the spark
plug hole. As you pull on the recoil handle the ,
piston should move up and down. The piston is put
Top Dead Center when it is up as high as it can go.
Allen Wmnol
in-lb$
LooNn Jam Nut
*
Using a 10mm wrench, loosen the rockerarm jam
nut. Use an 8ram allen wrench to tum the pivotball
stud while checking clearance between the rocker
arm and the valve stern with a feeler gauge.
Correct clearance is 0.002-0.004 inch (0.05-
0.1mm). Note: You must hold the rockerarm jam
n_ in place as you turn the pivotball stud.
,
When valve clearance is correct, hold the pivotball
stud in place with the allen wrench and tighten the
rocker arm jam nut. Tighten the jam nut to 65-85
inch-poundstorque. After tighteningthe jam nut,
recheck valve clearance to make sure ff did not
change.
14
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