Suzuki DR 125, Service Manual

Page: 105 / 222

FUEL AND LUBRICATION SYSTEM 4-9
INSPECTION
Check following items for any damage or clogging.
* Pilot jet
* Needle valve
* Main jet
* Main air jet
* Gasket and O-ring
* Pilot air jet * Throttle valve
* Needle jet air bleeding hole * Pilot outlet and by-pass
NEEDLE VALVE INSPECTION
If foreign matter is caught between the valve seat and the nee-
dle, the gasoline will continue flowing and cause it to overflow. If
the seat and needle are worn beyond the permissible limits, sim-
ilar trouble will occur. Conversely, if the needle sticks, the gaso-
line will not flow into the float chamber. Clean the float chamber
and float parts with gasoline. If the needle is worn as shown in
the illustration, replace it together with a valve seat. Clean the
fuel passage of the mixing chamber with compressed air.
FLOAT HEIGHT ADJUSTMENT
To check the float height, invert the carburetor body, with the
float arm kept free, measure the height
A
while float arm is just
in contact with needle valve by using calipers.
Bend the tongue
1
as necessary to bring the height
A
to this
value.
%
Float height
A
: 18.9 ± 1.0 mm (0.74 ± 0.04 in)
&
09900-20102: Venier calipers
REASSEMBLY AND REMOUNTING
Reassemble and remount the carburetor in the reverse order of
disassembly and removal.
Pay attention to the following points:
• Align the projection
A
on the carburetor body with the slit
B
of the throttle valve
1
.
• Ajust the following items to the specification.
*Engine idle speed . . . . . . . . . . . . . . . . . . .
!
2-8
*Throttle cable play . . . . . . . . . . . . . . . . . . .
!
2-8