39
732-848B
NOTE: If a carburetor choke cable
is adjusted too tight when the engine
reaches operating temperature, the
air/fuel mixture will be incorrect and
the engine will idle poorly and may
operate only on one cylinder.
Synchronizing Throttle
Cable/Piston Valves
(External)
1. Remove the air-intake silencer boots
from the silencer to access the intake
bores.
2. Rotate the idle speed screws coun-
terclockwise until all spring tension
is removed.
3. Slide the insulators away from the
adjusters; then loosen the jam nut
securing each throttle cable adjuster.
Rotate each adjuster clockwise until
each piston valve bottoms in the pis-
ton valve bore.
4. In turn on each carburetor, place a
finger lightly against the side of the
piston valve; then rotate the carbure-
tor adjuster counterclockwise until
slight upward movement of the
valve is noted.
5. Check to make sure the valves start
to open at the exact same moment by
placing a thumb and finger against
the valves; then lightly compress the
throttle lever.
NOTE: If an individual piston valve
starts to open before another, rotate
the adjuster on the valve which is
lifting first clockwise, just enough to
synchronize the valves. Recheck by
repeating steps 2-5.
6. With the piston valves synchronized,
tighten adjuster jam nuts securely; then
slide the insulators onto the adjusters.
NOTE: There must be free-play in
the throttle lever.
7. In turn on each carburetor, place a
finger against the piston valve.
Rotate the idle speed screw clock-
wise until it contacts the valve.
8. Compress the throttle lever to the
full-open position; then rotate each
idle speed screw clockwise 2 com-
plete turns. Release the throttle
lever.
NOTE: There must be 0.75-1.5 mm
(0.030-0.060 in.) free-play between
the throttle lever and the control
housing.
9. At this point, there must be 0.75-1.5
mm (0.030-0.060 in.) of cable free-
play gap in the throttle lever. If there
is no cable free-play in the throttle
lever, the throttle safety switches will
not function properly, and the engine
will cut out in the idle position.
0741-518
NOTE: If cable free-play gap is not
correct, rotate each adjuster an
equal amount until recommended
free-play is achieved. Each piston
valve must be resting against the tip
of its idle speed screw.
NOTE: If throttle cable free-play is
incorrect, the carburetor safety
switches will be activated prema-
turely and the engine will not start.
! WARNING
Be sure to tighten the adjuster jam
nuts securely. If an adjuster jam nut is
not tightened, the adjuster can rotate
out of the carburetor cap causing the
piston valve not to return to the full-
closed position.
Содержание Bearcat 570 2012
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