Yamaha WR250FR 2002 Owner's Service Manual page 136

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CARBURETOR
Starter plunger
1. Inspect:
• Cold starter plunger 1
• Hot starter plunger 2
Wear/damage → Replace.
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
6
5
• Lever 1 3
• Spring 1 4
• Lever 2 5
• Spring 2 6
Dirt → Clean.
Air cut valve
3
1. Inspect:
• Diaphragm (air cut valve) 1
• Spring (air cut valve) 2
• Air cut valve cover 3
• O-ring 4
Tears (diaphragm)/damage → Replace.
ASSEMBLY AND INSTALLATION
Carburetor
1. Install:
• Cold starter plunger 1
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ENG