Yamaha WR250FM service manual Pilot screw, Carburetor

CARBURETOR

ENG

1

HANDLING NOTE

CAUTION:

Do not loosen the screws (throttle position sensor) 1 except when changing the throt- tle position sensor due to failure because it will cause a drop in engine performance.

REMOVAL POINTS

Pilot screw

1.Remove:

• Pilot screw 1

NOTE:

To optimize the fuel flow at a small throttle opening, each machine’s pilot screw has been individually set at the factory. Before removing the pilot screw, turn it in fully and count the number of turns. Record this number as the factory-set number of turns out.

INSPECTION

Carburetor

1.Inspect:

•Carburetor body Contamination → Clean.

NOTE:

•Use a petroleum based solvent for cleaning. Blow out all passages and jets with com- pressed air.

•Never use a wire.

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