Yamaha WR450F(T) Owner's Service Manual page 324

CARBURETOR
Needle valve
1. Inspect:
• Needle valve 1
• Valve seat 2
Grooved wear a → Replace.
Dust b → Clean.
• Filter c
Clogged → Clean.
EC464300
Throttle valve
1. Check:
• Free movement
Stick → Repair or replace.
Insert the throttle valve 1 into the carbu-
retor body, and check for free movement.
EC464400
Jet needle
1. Inspect:
• Jet needle 1
Bends/wear → Replace.
• Clip groove
Free play exists/wear → Replace.
EC464511
Float height
1. Measure:
• Float height a
Out of specification → Adjust.
Float height:
8.0 mm (0.31 in)
4 - 12
ENG