Yamaha RS90K Manuel D'atelier page 604

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1
5
4
2
CARBURETORS AND FUEL PUMP
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1
3
2
6
3
10. Inspect:
11. Inspect:
12. Inspect:
7-7
7. Inspect:
• Piston valve 1
Damage/scratches/wear → Replace.
• Rubber diaphragm 2
Cracks/tears → Replace.
8. Inspect:
• Vacuum chamber cover 1
• Piston valve spring 2
• Jet needle holder 3
Cracks/damage → Replace.
9. Inspect:
• Jet needle 1
• Main jet 2
• Needle jet holder 3
• Pilot jet 4
• Pilot screw 5
• Needle jet 6
Bends/damage/wear → Replace.
Obstruction → Clean.
Blow out the jets with compressed air.
• Piston valve movement
Insert the piston valve into the carburetor
body and move it up and down.
Tightness → Replace the piston valve.
• Fuel feed pipes
• Hose joint
Cracks/damage → Replace.
Obstruction → Clean.
Blow out the pipes with compressed air.
• Fuel delivery hoses
Cracks/damage/wear → Replace.
Obstruction → Clean.
Blow out the hoses with compressed air.
CARB