4-10
ENG
CARBURETOR AND REED VALVE
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.
2. Inspect:
9
Main jet
1
9
Pilot jet
2
9
Power jet
3
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.
EC464210
Needle valve
1. Inspect:
9
Needle valve
1
9
Valve seat
2
Grooved wear
a
→
Replace.
Dust
b
→
Clean.
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.
1P8-9-31-4A 5/12/05 1:18 PM Page 20
Summary of Contents for YZ250(V)
Page 78: ...2 11 MAINTENANCE SPECIFICATIONS SPEC MEMO...
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