Yamaha 2012 Grizzly 300 Service Manual page 206

CARBURETOR
8 . Check:
• fuel hoses
Cracks/damage/wear
Obstruction
Clean.
Blow out the hoses with compressed air.
9 . Check:
• piston valve movement
Insert the piston valve into the carburetor
body and move it up and down.
Tightness Replace the piston valve.
10. Check:
• throttle valve movement
Sticks Replace.
11. Check:
• choke valve movement
Sticks Replace.
12. Check:
• starter plunger
• starter plunger spring
Bends/cracks/damage
6-6
CARB
Replace.
Replace.