Yamaha TT-R90(R) - Page 154

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ENG
CARBURETOR
EC464000
INSPECTION
Carburetor
1. Inspect:
●
Carburetor body
Contamination → Clean.
NOTE:
●
Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
●
Never use a wire.
2. Inspect:
●
Main jet 1
●
Pilot jet 2
●
Needle jet 3
Damage → Replace.
Contamination → Clean.
NOTE:
●
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.
NOTE:
Insert the throttle valve 1 into the carburetor
body, and check for free movement.