Idle Speed Adjustment - Yamaha YFM250XL(C) Service Manual

IDLE SPEED ADJUSTMENT

IDLE SPEED ADJUSTMENT
1.Place the machine on a level place.
2.Warm up engine for several minutes.
3.Adjust:
Engine idle speed
**********************************
Adjustment steps:
Turn the pilot screw 1 clockwise until it is
lightly seated.
Loosen the pilot screw by turning it coun-
terclockwise for the specified number of
turns.
Pilot screw:
2 counterclockwise turns
Turn the throttle stop screw 2 until the
Idle speed is in the specified range. Use
the Inductive Tachometer to confirm the
engine speed.
Clockwise
Counterclock-
wise
Inductive tachometer:
P/N. YU-08036-A, 90890-03113
Engine idle speed:
1,400 ~ 1,500 r/min
Turn the pilot screw 1 again clockwise or
counterclockwise in 1/8-turn increments
to achieve the highest speed with just the
pilot screw.
Once again, turn the throttle stop screw 2
to attain the specified idle speed.
**********************************
4.Check:
Throttle cable free play
Refer to "THROTTLE CABLE FREE PLAY
ADJUSTMENT" section.
3 - 13
INSP
ADJ
Idle speed becomes
higher.
Idle speed becomes
lower.
3