Engine Tune-Up
Fig. 9 - Adjusting Engine Idle Speed
operating approximately 15 rpm below the recommen-
ded idle speed.
IMPORTANT: It may be necessary to use the
buffer screw to eliminate the engine roll. Back
Fig. 10 - Adjusting Buffer Screw
out the buffer screw, after the idle speed is
established, to the previous setting (5/8").
1 . With the engine running at normal operating
temperature, turn the buffer screw in so it contacts the
NOTE: The recommended idle speed is 400-450
differential lever as lightly as possible and still
rpm, but may vary with certain engine
applications.
eliminates the engine roll (Fig. 10).
2. Hold the idle screw and tighten the lock nut.
NOTE: Do not increase the engine idle speed
more than 15 rpm with the buffer screw.
3. Install the high-speed spring retainer cover and
tighten the two bolts.
2. Recheck the maximum no-load speed. If it has
increased more than 25 rpm, back off the buffer screw
Adjust Buffer Screw
until the increase is less than 25 rpm.
With the idle speed properly set, adjust the buffer
3. Hold the buffer screw and tighten the lock nut
screw as follows:
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