Yamaha XV1600A1999 Service Manual page 365

CARBURETOR
8. Check:
S piston valve 1
Damage/scratches/wear ! Replace.
S piston valve diaphragm 2
Cracks/tears ! Replace.
9. Check:
S vacuum chamber cover 1
S piston valve spring 2
S jet needle holder 3
S jet needle spring 4
Cracks/damage ! Replace.
10. Check:
S jet needle kit 1
S main jet 2
S needle jet 3
S pilot jet 4
S starter jet 5
S pilot screw 6
S pilot air jet 7
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 starter plunger 1
S starter plunger spring 2
Bends/cracks/damage ! Replace.
S O-ring 3
Damage/wear ! Replace.
6-7
CARB
E