Suzuki DR-Z400S 2001 Service Manual page 120

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, replace it and the valve seat a new one.
Clean the fuel passage of the mixing chamber using compressed
air.
FLOAT HEIGHT ADJUSTMENT
To check the float height, turn the carburetor upside down.
Measure 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.
09900-20101: Vernier calipers
Float height A: 13.0 ± 1.0 mm (0.51 ± 0.04 in)
PISTON VALVE CONTROL SOLENOID INSPECTION
(FOR E-02, 19, 54)
Test the piston valve control solenoid for load current using an
ammeter.
To test the piston valve control solenoid, connect a 12 V battery
to the solenoid coupler. If the needle valve of the piston valve
control solenoid does not move, replace the piston valve control
solenoid with a new one.
THROTTLE POSITION SENSOR INSPECTION
Measure the resistance between the terminals as shown in the
illustration.
Throttle position sensor resistance: 3.5 – 6.5 kΩ Ω Ω Ω Ω
NOTE:
When performing this test, it is not necessary to remove the
throttle position sensor.
FUEL AND LUBRICATION SYSTEM
CORRECT
A
Bl
B
4-11
INCORRECT
Ammeter
A
Battery
Solenoid
coupler
Y
Ω