3-14 FUEL SYSTEM
Remove the throttle valve [A] and jet needle.
Inspect the outside of the throttle valve for scratches and abnormal
If the valve is badly scratched or worn, replace it.
Inspect the inside of the carburetor body for these same faults.
If it is badly scratched or worn, replace the entire carburetor.
[B] Sliding Surface
Check the jet needle [A] and needle jet holder [B] for wear.
A worn needle jet holder or jet needle should be replaced.
Check the tapered portion [A] of the pilot screw [B] for wear or
If the pilot screw is worn or damaged on the tapered portion it will
prevent the engine from idling smoothly. Replace it.
Disassemble the carburetor, and clean the fuel, air passages with a
high-ﬂash-point solvent and compressed air.
Stuff the lint-free, clean cloths into the air cleaner housing to keep
dirt or other foreign material from entering.
If dirt or dust is allowed to pass through into the carburetor,
the throttle valve may become stuck, possibly causing an