Carburetor - Adjust Idling (Mikuni Bst40); Checking The Float Level (Mikuni Bst40) - KTM 625 SXC 2003 Owner's Manual

CARBURETOR – Adjust idling (Mikuni BST 40) *
Idling adjustment of the carburetor strongly affects the engine's starting
behavior. That is, an engine whose idling speed is adjusted correctly will be
easier to start than one whose idling speed has not been adjusted
correctly.
Use the adjusting screw 1 to adjust the basic position of the throttle valve
and, thus, the idle speed. Turning in clockwise direction will increase the
1
idling speed, turning in counterclockwise direction will reduce the idling
speed. Normal idling speed 1400 - 1500 rpm.
Basic information on carburetor wear
As a result of engine vibrations, throttle valve, jet needle, and needle jet are
subjected to increased wear. This wear may cause carburetor malfunction
(e.g., overly rich mixture). Therefore, these parts should be replaced after
200 hours.
Checking the float level (float height) *
2
Dismount the carburetor and remove the float chamber. Hold down the
2
float frame and tilt the carburetor as shown in the photo. Float can be
tilted downwards in this position.
42
Turn carburator slowly until the float moves towards the carburator. In this
3
position the edge of the float must be parallel to the sealing surface of
4
the carburator .
CAUTION
! !
I ,
F YOU HOLD ON TURNING THE CARBURATOR THE FLOAT WILL PRESS AGAINST THE
. I
SPRING OF THE NEEDLE VALVE AND A CORRECT CHECK IS NOT POSSIBLE N THAT CASE
.
THE CARBURATOR IS TO BE TURNED BACK AND THE CHECK MUST BE DONE TWICE
If the two edges are not parallel, correction can be done by bending the
lever of the needle valve. At the end a check is necessary again.
Mount the float chamber, install the carburetor, and adjust the idle speed.
3
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