Yamaha YFM250RX 2008 Service Manual page 203

CARBURETOR
5. Check:
• piston valve movement
Sticks → Replace.
Insert the piston valve into the carburetor
body, and check for free movement.
6. Check:
• throttle valve movement
Sticks → Replace.
7. Check:
• cover
• diaphragm spring
Cracks/damage → Replace.
8. Check:
• coasting enricher diaphragm
• spring
Cracks/damage → Replace.
9. Check:
• jet needle
Bends/wear/damage → Replace.
• clip groove
Free play/wear → Replace.
10.Check:
• main jet
• pilot jet
• needle jet
• needle jet holder
• starter jet
• coasting enricher jet (P. A. J. 2)
Bends/wear/damage → Replace.
Blockage → Blow out the jets with com-
pressed air.
5-5
CARB