g. Inspect the throttle plate for burrs or damaged edges. Do not attempt to clean the throttle plate with a wire wheel
or a sharp instrument.
h. Examine the throttle shaft and lever for wear. If the throttle shaft is noticeably worn or if the lever is loose on the
shaft, this assembly must be replaced.
i. Inspect the point of the idle adjusting needle (34). It within the limits set up by the choke assembly screw.
j. Inspect the bearing surfaces of the choke shaft and lever. See that the shaft is straight and that the lever is
securely fastened to the shaft.
187. Carburetor Reassembly
a. Install the shaft hole plug (37) into the throttle shaft opening of the throttle body (38), and stake it in place with a
sharp chisel. Then place the shaft seal retainer (31) and the shaft seal (32) on the throttle shaft and lever (28). Insert the
throttle shaft and lever into the throttle body while holding the throttle body with the flanged end down. Rotate the shaft to
the wide open position with the cutout section of the shaft facing away from the idle discharge ports. Insert the throttle
plate (39) with the bevel on the leading edge away from the idle discharge ports. Close the throttle and center the plate so
that the bevel fits the bore snugly; then start the throttle plate screws (40). Hold the throttle in the closed position and, at
the same time, press in on the end of the throttle shaft to press the packing snugly in place while tightening the throttle
plate screws securely. Screw the idle adjusting needle (34) with spring (35) into the throttle body. Seat it lightly against the
needle seat and then back out one and one-half turns as a preliminary adjustment.
b. Install the bowl channel plugs (21 and 46) with the special shot punch (par. 179).
c. Assemble the fuel screen (26) to the channel plug (27).
Install the fiber washer (25) on the filter plug, and
install this group of parts in the fuel bowl.
d. Install the main jet (23) and fiber washer (24) with the special main jet wrench (par. 179). Install the main jet (23)
and fiber washer (20) into the fuel bowl.
e. Install the check valve (18), disk side down, in the bottom of the fuel bowl and flush with the casting. Use the
special check valve tool (par. 179) for installation. Then screw the valve channel plug (48) and fiber washer (20) down
into place in the fuel bowl.
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