GAS GAS EC250E 2012, Owner'S Manual

Page: 62 / 81

Owner’s manual
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Carburetor setting
This chapter is for users with high mechanical knowledge and experience.
Otherwise these adjustments, must be carrie by your GAS GAS o ffi cial service.
IDLE JET AND MIXTURE SCREW
Controls the mixture from the closed posi ti on to ⅛ of charge, but has li tt le e ff ect
on total openness. To adjust the mixture, the mixture screw can be rotated to
change the air fl ow, or change the idle jet so it lets pass more or less fuel. Start by
turning the air screw. Inward screwing enriches the mixture. The mixture screw
must rotate from a posi ti on of fully closed. Make changes by half-turn increments.
If turning the screw 1 to 2.5 turns do not get the desired result, change a step in
the idle jet (1) and tune the mixture screw (2).
1
2
THROTTLE VALVE OPENING INFLUENCES
The elements of the carburetor that alters the composi ti on of the mixture ba-
sed on the opening of the thro tt le valve (load) depends on the openness of it:
• Zone A: 0 to ⅛ load (thro tt le opening). Its regula ti on depends on the idle
screw, the mixture screw and the idle jet (low or minimal).
• Zone B: from ⅛ to ¼ load. In fl uenced primarily by the height of the slide
bezel.
• Zone C: ¼ to ¾ load. Responsible is the jet needle..
• Zone D: ¾ full load. Responsible is the main jet.
A
B
C
D
Introduction