3-22 FUEL SYSTEM
Remove the carburetor (see Carburetor Removal).
Before disassembling the carburetor, check the fuel level
(see Service Fuel Level Inspection).
If the fuel level is incorrect, inspect the rest of the carbu-
retor before correcting it.
Turn the throttle pulley to check that the throttle valve [A]
moves smoothly and returns by spring pressure.
If the throttle valve does not move smoothly. Replace the
throttle valve or pulley spring.
Disassemble the carburetor (see Carburetor Disassem-
Clean the carburetor (see Carburetor Cleaning).
Check the tapered portion [A] of the pilot air screw [B] for
wear or damage.
If the pilot air screw is worn or damaged on the tapered
portion , it will prevent the engine from idling smoothly.
Remove the float valve needle.
Check the plastic tip [A] of the float valve needle [B] for
If the needle is worn as shown right [C], replace the valve
Push the rod [D] in the valve needle, then release it.
If the rod does not come out fully by spring tension, re-
place the valve needle.
Push and release [E]
Remove the starter jet.
Check the slow jet for any damage.
If the slow jet is damaged, replace it with a new one.
Remove the throttle valve and jet needle.
Inspect the outside of the throttle valve and plate for
scratches and abnormal wear.
If it is badly scratched or worn, replace the throttle valve
Inspect the inside of the carburetor body for these same
If it is badly scratched or worn, replace the entire carbu-
Check the jet needle for wear.
For the throttle sensor inspection, see the Electrical Sys-
A worn jet needle should be replaced.
Clean the fuel and air passages with a high-flash point
solvent and compressed air.