Yamaha WR250FM Bicycle User Manual


 
4 - 12
ENG
CARBURETOR
2. Inspect:
Main jet 1
Pilot jet 2
Needle jet 3
Starter jet 4
Pilot air jet 5
Leak jet 6
Damage Replace.
Contamination Clean.
N
OTE:
Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
Never use a wire.
Needle valve
1. Inspect:
Needle valve 1
Valve seat 2
Grooved wear a Replace.
Dust b Clean.
EC464301
Throttle valve
1. Check:
Free movement
Stick Repair or replace.
N
OTE:
Insert the throttle valve 1 into the carburetor
body, and check for free movement.
EC464401
Jet needle
1. Inspect:
Jet needle 1
Bends/wear Replace.
Clip groove
Free play exists/wear Replace.
Clip position
Standard clip position:
No.4 Groove