Checking/Setting The Float Level (50 Sx); Carburetor - Adjusting Idle Speed (50 Sx) - KTM 50 SX 2010 Repair Manual

31/CARBURETOR

Checking/setting the float level (50 SX)

18.17

Carburetor - adjusting idle speed (50 SX)

18.18
Condition
The carburetor and float chamber have been removed.
–
Tilt the carburetor sideways, preventing the fulcrum pin from falling out.
–
Tilt the carburetor until the float is resting against the float needle valve, but the
float needle valve is not being pressed together.
» If the edge of the float is not parallel (max. 1° deviation upwards) to the sealing
area of the float housing in this position:
–
Adjust the float level by bending float lever
300915-10
–
Screw in the idle adjusting screw
setting.
Guideline
Idle mixture adjusting screw
Open
–
Run the engine until warm.
Guideline
Warm-up time
700520-01
Danger
Danger of poisoning Exhaust gases are poisonous and inhaling them may
result in unconsciousness and/or death.
–
When running the engine, always make sure there is sufficient ventila-
tion, and do not start or run the engine in an enclosed space without an
effective exhaust extraction system.
–
Adjust the idle speed with the adjusting screw
Guideline
Choke function deactivated – Choke knob is in lower position. No O-ring is visi-
ble.
Idle speed
–
Turn the idle adjusting screw
–
Note the position and turn the idle adjusting screw slowly counterclockwise until
the idle speed falls.
–
Adjust to the point between these two positions with the highest idle speed.
Info
If the speed rise is too high, reduce the idle speed to a normal level and
repeat the preceding steps.
If the procedure described here does not lead to satisfactory results, the
cause may be a wrongly dimensioned idling jet.
If you can turn the idle adjusting screw to the end without any change of
engine speed, you have to install a smaller idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
Following extreme air temperature or altitude changes, adjust the idle speed
again.
.

until it stops and then to the prescribed basic

3 turns
≥ 5 min
.

1,400... 1,500 rpm
slowly clockwise until the idle speed begins to fall.

107