Yamaha YZ450FY 2009 Owner's Service Manual page 117

CHECKING THE FLOAT
1. Inspect:
• Float "1"
Damage → Replace.
CHECKING THE STARTER PLUNGER
1. Inspect:
• Cold starter plunger "1"
• Hot starter plunger "2"
Wear/damage → Replace.
CHECKING THE ACCELERATOR PUMP
1. Inspect:
• Diaphragm (accelerator pump) "1"
• Spring (accelerator pump) "2"
• Accelerator pump cover "3"
• O-ring "4"
• Push rod "5"
Tears (diaphragm)/damage → Replace.
Dirt → Clean.
2. Inspect:
• Throttle shaft "1"
• Spring "2"
• Lever 1 "3"
• Spring 1 "4"
• Lever 2 "5"
• Spring 2 "6"
Dirt → Clean.
ASSEMBLING THE CARBURETOR
1. Install:
• Cold starter plunger "1"
2. Install:
• Pilot air jet "1"
3. Install:
• Spring 1 "1"
• Lever 1 "2"
To lever 2 "3".
Make sure the spring 1 fits on the stopper "a" of
the lever 2.
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CARBURETOR