31/CARBURETOR 107
18.17Checking/setting the float level (50 SX)
Condition
The carburetor and float chamber have been removed.
300915-10
– 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 .
18.18Carburetor - adjusting idle speed (50 SX)
700520-01
– Screw in the idle adjusting screw until it stops and then to the prescribed basic
setting.
Guideline
Idle mixture adjusting screw
Open 3 turns
– Run the engine until warm.
Guideline
Warm-up time ≥ 5 min
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 1,400… 1,500 rpm
– Turn the idle adjusting screw slowly clockwise until the idle speed begins to fall.
– 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.
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