3-18 FUEL SYSTEM
Disassemble the throttle valve assembly; jet needle
holder [A] (unscrew), spring [B], retainer [C], jet needle
with circlip [D], O-ring with throttle valve plate [E], and
throttle valve [F].
Remove the choke knob/starter plunger assembly [A]
from the carburetor.
Remove the throttle pulley shaft [A] with the spring [B],
steel washer [C], plastic washer [D], and throttle valve link
Turn the throttle pulley shaft [A] clockwise while holding
down the acceleration pump lever [B] and clear the idle
stop screw [C] to the stopper [D] of the pulley.
Turn in the pilot air screw [A] fully but not tightly and count
the number of turns.
Record this number as the manufacture-set number of
turns out to put back to the original position.
Unscrew the pilot air screw.