Carburetor Inspection

Check the following items for any damage or clogging.

Valve seat Piston valve Starter (enricher) jet Gasket and O-ring Throttle shaft oil seal Diaphragm

Pilot outlet and by-pass ports

* Pilot jet

* Main jet

* Main air jet

* Pilot air jet

* Needle jet air bleeding hole

* Float

* Needle valve

* Jet needle


If foreign matter is caught between the valve seat and the needle valve, the gasoline will continue flowing and overflow. If the valve seat and needle valve are worn beyond the permissible limits, similar trouble will occur. Conversely, if the needle valve sticks, the gasoline will not flow into the float chamber. Clean the float chamber and float parts with gasoline. If the needle valve is worn, as shown in the illustration, replace it along with a new valve seat. Clean the fuel passage of the mixing chamber using compressed air.


To check the float height, turn the carburetor upside down. Measure the float height ® while the float arm is just contacting the needle valve using vernier calipers. Bend the tongue © as necessary to bring the float height ® to the specified level.

troil 09900-20102: Vernier calipers

ESKJ Float height ®: 17.0 ± 1.0 mm (0.67 ± 0.04 in)


Measure the resistance between the terminals as shown.

EfflSS Throttle position sensor resistance: Approx. 5 kQ


When performing this test, it is not necessary to remove the throttle position sensor.

Pilot screw

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