Yamaha YZF-R1 1998 Service Manual page 254

CARBURETORS
EB600031
CHECKING THE CARBURETORS
The following procedure applies to all of
the carburetors.
1. Check:
• carburetor body
• float chamber
Cracks/damage → Replace.
2. Check:
• fuel passages
Obstruction → Clean.
a. Wash the carburetor in a petroleum-
based solvent. Do not use any caustic
carburetor cleaning solution.
b. Blow out all of the passages and jets
with compressed air.
3. Check:
• float chamber body
Dirt → Clean.
4. Check:
• float chamber rubber gasket 1
Cracks/damage/wear → Replace.
5. Check:
• float
Damage → Replace.
6. Check:
• needle valve 1
• needle valve seat 2
Damage/obstruction/wear → Replace
the needle valve, needle valve seat and
O-ring as a set.
7. Check:
• O-ring 3
Damage/wear → Replace the needle
valve, needle valve seat and O-ring as
a set.
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CARB