Yamaha 5YF2-AE1 Service Manual page 169

CARBURETOR
5. Check:
• carburetor top cover 1
• spring 2
Cracks/damage → Replace.
6. Check:
• jet needle 1
• main jet 2
• needle jet 3
• pilot jet 4
• pilot screw 5
• throttle stop screw 6
Bends/wear/damage → Replace.
Blockage → Blow out the jets with com-
pressed air.
7. Check:
• piston valve movement
Sticks → Replace the piston valve.
Insert the piston valve into the carburetor
body, and check for free movement.
8. Check:
• choke valve movement
Sticks → Replace.
EBS00152
ASSEMBLING THE CARBURETOR
CAUTION:
_
• Before reassembling, wash all of the
parts in a clean petroleum based solvent.
• Always use a new gasket.
1. Install:
• pilot screw 1
Pilot screw setting
2-1/2 turns out
5 - 4
CARB