Download Print this page

YAMAHA YZ250F(D) Owner's Service Manual Page 191

Hide thumbs

Advertisement

Symptom
Closed to 1/4 throttle
Hard breathing
Speed down
Closed to 1/4 throttle
Poor acceleration
Poor response in the low to in-
termediate speeds
Poor response when throttle is
opened quickly
This should be taken simply for an example. It is necessary to set the carburetor while checking the operating conditions
of the engine.
Setting
Use jet needle with a smaller diameter.
Use jet needle with a larger diameter.
Raise jet needle clip position. (1 groove up)
Raise jet needle clip position.
If this has no effect, lower the jet needle clip
position.
Check overall settings.
Use main jet with a lower calibration no.
Raise jet needle clip position. (1 groove up)
If these have no effect, use a main jet with
a higher calibration no. and lower the jet
needle clip position.
7-5
Checking
Slow-speed-circuit passage
Clogged → Clean.
Overflow from carburetor
Check air filter for fouling.
Check that the accelerator pump operates
smoothly.
ENGINE

Advertisement

Comments to this Manuals

Symbols: 0
Latest comments:
  • rodrigo Dec 03, 2017 02:34:
    MUY INTERESANT​E EL MANUAL PORQUE AYUDA PARA TENER A PUNTO UN MOTOR BIEN ARMADO TAL COMO INDICA EL MANUAL.