Buell Blast 2014, Service Manual

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4-4 2004 Buell P3: Fuel System
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Table 4-5. Vacuum Piston Assembly Troubleshooting
PISTON DOES NOT RISE PROPERLY
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.
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
Check for:
1. Spring damaged.
2. Piston binding.
3. Piston diaphragm ring dirty or damaged.
Remedy:
1. Replace spring.
2. Clean piston slides and body or replace piston.
3. Clean or replace piston.