MAINTENANCE
SYNCHRONIZATION AND LINKAGE ADJUSTMENTS - 25/30
Connect a throttle shaft amplifier to the carburetor Throttle Control Rod
throttle shaft
as
shown.
IMPORTANT: Offset
on
pivot block must face
toward the
control
rod
collar.
While
rotating the propeller shaft, move the shift
lever to FORWARD.
Loosen the
control
rod
collar screw. Advance the
1
throttle lever until
it
contacts the stop on the cylin-
der block. Move the throttle control
rod
forward
until the carburetor throttle plate
is
horizontal.
1.
Amplifier 26423
Advance the throttle until the tip of the amplifier
begins to move.
At
this point, the cam follower
roller should
contact the
cam
between the indica-
tor marks.
1
1.
Indicator marks
To
adjust, loosen the screw retaining the adjust-
ment
lever to the throttle shaft. Slide the adjust-
ment
lever up or down to make the adjustment.
1
74
1
2
3
1. Pivot block
45103
2.
Collar screw
3. Throttle lever
Move the control
rod
collar backward until it
touches the pivot
block. Tighten the collar screw
securely.
IMPORTANT: Check your adjustment. The car-
buretor
throttle plate must
be
exactly horizontal
when the throttle lever
is
fully advanced.
Maximum Spark Advance
IMPORTANT:
Run
the engine with the proper
test
wheel.
Do
not
run
the engine with a propeller
or a flushing adapter for this adjustment.
Connect a timing
light to the top cylinder. Start the
engine and
allow it to reach normal operating tem-
perature.
Run
the engine at full throttle
in
FORWARD to
check maximum spark advance.
Maximum
Spark Advance
25/30 I 30° BTDC
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