Buell 2005 P3 Service Manual page 262

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Table 4-5. Vacuum Piston Assembly Troubleshooting
Check for:
1. Piston atmosphere vent blocked.
2. Diaphragm cap loose, damaged or leaking.
3. Spring binding.
4. Diaphragm pinched at lip groove.
5. Torn diaphragm.
6. Piston binding.
7. Piston vacuum passage plugged.
Check for:
1. Spring damaged.
2. Piston binding.
3. Piston diaphragm ring dirty or damaged.
4-4 2005 Buell P3: Fuel System
PISTON DOES NOT RISE PROPERLY
Remedy:
1. Clear vent.
2. Tighten or replace cap.
3. Correct or replace spring.
4. Reposition diaphragm lip.
5. Replace piston diaphragm assembly.
6. Clean piston slides and body or replace piston.
7. Clean and clear passage.
PISTON DOES NOT CLOSE PROPERLY
Remedy:
1. Replace spring.
2. Clean piston slides and body or replace piston.
3. Clean or replace piston.