Yamaha ttr230 Service Manual page 190

CARBURETOR
5. Check:
• Needle valve seat 1
• Needle valve 2
• O-ring 3
Damage/wear => Replace assembly.
NOTE:
Replace the needle valve and its seat as a
whole.
6. Check:
• Choke assembly 1
Warping/wear/damage => Replace.
• Spring 2
Damage => Replace.
7. Check:
• Diaphragm 1
Damage => Replace.
• Spring 2
Damage => Replace.
8. Check:
• Float 1
• Float arm 2
Damage => Replace.
9. Observe:
• Movement smoothness
Irregular => Replace.
Insert the throttle valve in the carburetor
and check the movement smoothness.
5-6
CARB