Yamaha XVZ13TF 1999 Service Manual page 287

CARBURETORS
8. Check:
S piston valve 1
Damage/scratches/wear ! Replace.
S rubber diaphragm 2
Cracks/tears ! Replace.
9. Check:
S vacuum chamber cover 1
S piston valve spring 2
S jet needle holder
Cracks/damage ! Replace.
10. Check:
S jet needle kit 1
S needle jet 2
S main jet 3
S pilot jet 4
S pilot screw 5
Bends/damage/wear ! Replace.
Obstruction ! Clean.
Blow out the jets with compressed air.
11. Check:
S piston valve movement
Insert the piston valve into the carburetor
body and move it up and down.
Tightness ! Replace the piston valve.
12. Check:
S fuel feed pipes
S hose joint
Cracks/damage ! Replace.
Obstruction ! Clean.
Blow out the pipes with compressed air.
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CARB