Carburetor Inspection; Needle Valve Inspection; Throttle Valve Inspection - Yamaha YZ250(R)/LC Owner's Service Manual

CARBURETOR AND REED VALVE
4-10
EC464000
INSPECTION
EC464130
Carburetor
1. Inspect:
9 Carburetor body
Contamination ¡ Clean.
NOTE:
9 Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
9 Never use a wire.
2. Inspect:
9 Main jet 1
9 Pilot jet 2
9 Power jet 3
Contamination ¡ Clean.
NOTE:
9Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
9Never use a wire.
EC464210
Needle valve
1. Inspect:
9 Needle valve 1
9 Valve seat 2
Grooved wear a ¡ Replace.
Dust b ¡ Clean.
EC464310
Throttle valve
1. Check:
9 Free movement
Stick ¡ Repair or replace.
NOTE:
Insert the throttle valve 2 into the carburetor
body while pulling up the lever 1, and check for
free movement.
ENG