Setting The Idle Speed; Setting The Carburetor - SHERCO 250 SE/R Handbuch

250-300 SE/R
Motor setting (continued)

SETTING THE IDLE SPEED

SETTING THE CARBURETOR

How the opening of the throttle slide influences performance:
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2
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- The idle speed is adjust with adjusting screw
- The idle mixture is adjusted with the idle air
adjusting screw .
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Start the bike and allow it to reach operating
temperature .
Adjust the idle speed by turning the air screw
2200 +/- 100 rpm
Turn the adjust screw idle mixture all the way
and turn it to 1 turn 1/2.
Idle speed
Idle air adjusting open
The composition of the mixture (Air-Gas)
is a function of the opening of the slide:
• A: Idle range
From 0 to opening of the throttle slide,
this range is regulated by the idle screw
and the air screw .
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• B: Transition range
From to ¼ opening of the throttle slide, this
range is regulated by the idle jet and the shape
of the slide.
• C: Mid-range :
From ¼ to ¾ opening of the throttle slide, this
range is regulated by the needle valve (shape
and position). In the lower range, the idle circuit,
and in the higher range, the main jet take into
account the control of the motor.
• D: Full load
From ¾ to full throttle slide opening, this range
is controlled by the main jet and the needle jet.
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2200 +/- 100 rpm
1T 1/2
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