Yamaha WR450F(R) Owner's Service Manual page 324

CARBURETOR
Needle valve
1. Inspect:
Needle valve 1
G
Valve seat 2
G
Grooved wear a → Replace.
Dust b → Clean.
EC464300
Throttle valve
1. Check:
Free movement
G
Stick → Repair or replace.
Insert the throttle valve 1 into the car-
buretor body, and check for free move-
ment.
EC464400
Jet needle
1. Inspect:
Jet needle 1
G
Bends/wear → Replace.
Clip groove
G
Free play exists/wear → Replace.
Clip position
G
Standard clip position:
No.4 Groove
EC464511
Float height
1. Measure:
Float height a
G
Out of specification → Adjust.
Float height:
8.0 mm (0.31 in)
4 - 12
ENG