Chapter 1: INTRODUCTION
8
9. Intake valve lash (carburetor side) should be
.004”-.006” (0.10 - 0.15mm).
See Figure 1.11.
10. Exhaust valve lash (muffler side) should be .006-
.008” (0.15 - 0.20mm).
See Figure 1.12.
11. Use a 10mm wrench to loosen the jam nut, and
a 14mm wrench to adjust the rocker arm fulcrum
nut.
See Figure 1.12.
• Tighten the rocker arm fulcrum nut to close-up
the clearance between the end of the valve stem
and the contact point on the rocker arm.
• Loosen the rocker arm fulcrum nut to open-up
the clearance between the end of the valve stem
and the contact point on the rocker arm.
12. Hold the fulcrum nut with a 14mm wrench,
tighten the jam nut to a torque of 80 - 106 in-lb.
(9-12 Nm) using a 10mm wrench.
13. Double-check the clearance after tightening the
jam nut, to confirm that it did not shift. Re-adjust
if necessary.
14. Rotate the engine through several compression
cycles:
• Observe the movement of the valve gear.
• Return the piston to TDC compression stroke
and re-check the valve lash to confirm consistent
movement of the valve gear, including the slight
bump to the exhaust valve from the automatic
compression release.
15. Clean-up any oil around the valve cover open-
ing, clean the valve cover, replace the valve
cover gasket if necessary.
16. Install the valve cover, tightening the valve cover
screws to a torque of 62 - 80 in-lbs (7-9 Nm).
IMPORTANT: Over tightening the valve cover
will cause it to leak.
17. Install the spark plug.
Cleaning the engine
1. To maintain a proper operating temperature and
to keep the equipment looking good; all debris
should be removed from the engine.
2. It is recommended to use compressed air to
blow all of the debris off of the engine.
NOTE: A pressure washer may be used to clean
outdoor power equipment but only after the unit
has been allowed to properly cool.
NOTE: Mice and other critters tend to build
nests inside the engine shrouds while the snow
blower is stored during the long off season.
Figure 1.11
.006” feeler
gauge
Figure 1.12
.008” feeler
gauge
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