FUEL AND LUBRICATION SYSTEM 4-19
CARBURETOR INSPECTION
Check the following items for any damage or clogging.
* Pilot jet * Jet needle
* Main jet * Valve seat
* Main air jet * Piston valve
* Pilot air jet * Starter (enricher) jet
* Needle jet air bleeding hole * Gasket and O-ring
* Float * Throttle shaft oil seal
* Needle valve * Diaphragm
* Pilot outlet and by-pass ports
NEEDLE VALVE INSPECTION
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 com-
pressed air.
FLOAT HEIGHT ADJUSTMENT
To check the float height, turn the carburetor upside down. Mea-
sure the float height A while the float arm is just contacting the
needle valve using vernier calipers.
Bend the tongue as necessary to bring the float height A to the
specified level.
##
##
# 09900-20102: Vernier calipers
%%
%%
% Float height A: 17.0
±±
±±
± 1.0 mm
THROTTLE POSITION SENSOR INSPECTION
Measure the resistance batween the terminals as shown in the
illustration.
%%
%%
% Throttle position sensor resistance: Approx. 5 k
ΩΩ
ΩΩ
Ω
NOTE:
When performing this test, it is not necessary to remove the throttle
position sensor.
CORRECT
INCORRECT
To Next Page
Loading...
Need help?
General
