FUEL SYSTEM 3-23
Carburetor
•
Disassemble the carburetors (see Carburetor Disassem-
bly).
•
Clean the carburetor (see Carburetor Cleaning).
•
Check the vacuum piston diaphragm [A], and the O-rings
[B] on the float bowl, pilot screw, coasting enricher, and
starter plunger cap.
If any of the diaphragm or O-rings are not in good condi-
tion, replace them.
•
Check the plastic tip [A] of the float valve needle. It should
be smooth, without any grooves, scratches, or t ears.
If the plastic tip is damaged [C], replace the float valve [B].
•
Push the r od [D] in the other end of the float valve needle
and then release it [E].
If it does not spring out, replace the float valve.
•
Check the tapered portion [A] of the pilot screw [B] for
wear or damage.
If the pilot screw is worn or damaged on the tapered por-
tion, it will prevent the engine from idling smoothly. Re-
place it.
•
Check that the vacuum piston moves smoothly in the car-
buretor body. The surface of the piston must not be ex-
cessively worn.
If the vacuum piston does not move smoothly, or if it is
very loose in the carburetor body, replace both the body
and the vacuum piston.
