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1
Combustion Chamber
Remove combustion chamber deposits every
500 hours or whenever the cylinder head is
removed.
With the piston at Top Dead Center (TDC),
scrape deposits from top of piston and upper
bore with a plastic scraper.
Remove the loosened deposits from around the
top ring land area using compressed air or a
shop vacuum and a soft bristle brush.
NOTICE: Use care to prevent debris from
entering the valve lever or oil return cavities in
cylinder. Do not damage bore, top of piston,
cylinder head, or gasket mounting surfaces.
It is not necessary to remove the discoloration
marks on the piston, valves, and/or cylinder
head. These marks are normal and will not affect
engine operation.
ENGINE ADJUSTMENTS
Throttle Cable Adjustment
The remote control wire should measure 2.125”
(54mm) when extended outside the casing
(A, Figure 1-6). After installation, the travel (B) of
the remote control wire must be at least 1.375”
(35 mm). If the travel of the remote control wire
does not reach the minimum distance, use the
following procedure to adjust the cable:
1. Loosen casing clamp screw (C).
2. Move throttle lever to FAST position.
3. Move casing in direction of arrow (D) until
slack is removed.
4. Tighten casing clamp screw. Torque to
values listed in Section 12 - Engine
Specifications.
Figure 1 - 6
Governor Adjustments
A complete governor system adjustment
includes a static adjustment, engine warm-up,
and top no-load adjustment. Be sure to complete
all steps.
Static Adjustment
1. Loosen nut (A, Figure 1-7) until governor
lever (B) moves freely from governor
crank (C).
2. Move throttle linkage (D) until throttle plate
(E) is wide open.
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