Gasoline is extremely ﬂammable and can be explosive under
certain conditions. Always stop the engine and do not smoke.
Make sure the area is well-ventilated and free from any source
of ﬂame or sparks; this includes any appliance with a pilot
Remove the carburetor.
Before disassembling the carburetor, check the fuel level.
If the fuel level is incorrect, inspect the rest of the carburetor before
Check that the throttle valve [A] moves smoothly and return back with
the spring tension. The surface of the valve must not be excessively
If the throttle valve does not move smoothly, or if it is very loose in
carburetor body. Replace the carburetor.
If the spring tension is weak, replace it.
Turn the starter cable bracket to check that the starter butterﬂy valve
[A] move smoothly and return with spring tension.
If the starter butterﬂy valve do not move smoothly, replace the
Do not remove the air screw from the carburetor or change the air
screw setting, or you will lose the best setting.
Disassemble the carburetor.
Clean the carburetor.
Check that the O-rings on the ﬂoat bowl, drain plug and the intake
pipe are in good condition.
If any of the O-rings are not in good condition, replace them.
Remove the ﬂoat valve needle.
Check the ﬂoat valve needle [A].
If the needle is worn [B] as shown in the ﬁgure, replace the valve
Push the rod [C] in the valve needle, and then release it.
If the rod does not spring out, replace the valve needle.
Check the main jet [A], needle jet holder [B] and pilot jet [C] for any
If they are damaged, replace them with new ones.
FUEL SYSTEM 3-13