buell s1 lightning '97 Manual
4-3
Table 4-1. Fuel System Troubleshooting
OVERFLOW
Check for:
1.
Restricted fuel tank vent system.
2.
Loose float bowl screws.
3.
Damaged float bowl O-ring.
4.
Damaged or leaking float assembly.
5.
Particle contamination in fuel inlet fitting cavity.
6.
Worn or dirty inlet valve or seat.
7.
Improper fuel level in float bowl.
Remedy:
1.
Correct restricted hose. Replace vapor vent valve.
2.
Tighten screws.
3.
Replace O-ring.
4.
Replace float assembly.
5.
Clean and clear cavity and fuel supply tract.
6.
Clean or replace valve and clean seat.
7.
Adjust float tab for correct fuel level.
POOR IDLING
Check for:
1.
Idle speed improperly adjusted.
2.
Inlet system air leak (faster idling).
3.
Loose low speed jet.
4.
Contaminated or plugged low speed system.
5.
Enrichener valve not seated or leaking.
6.
Leaking accelerator pump.
Remedy:
1.
Adjust operating idle speed.
2.
Correct as required.
3.
Tighten jet.
4.
Clean, clear and correct as required.
5.
Adjust, clean or replace.
6.
Repair.
POOR FUEL ECONOMY
Check for:
1.
Excessive use of enrichener system.
2.
Enrichener valve not seated or leaking.
3.
Dirty air cleaner filter element.
4.
Restricted fuel tank vent system.
5.
High speed riding style.
6.
Idle speed improperly adjusted.
7.
Loose jets.
8.
Fuel level too high.
9.
Plugged or restricted bowl vent.
10. Worn or damaged needle or needle jet.
11. Vacuum piston assembly malfunction.
12. Plugged air jets or passages.
13. Excessive accelerator pump output.
11. Vacuum piston assembly malfunction.
12. Plugged air jets or passages.
13. Excessive accelerator pump output.
Remedy:
1.
Limit system use.
2.
Adjust, clean or replace.
3.
Clean or replace as required.
4.
Correct restricted hose. Replace vapor vent valve.
5.
Modify riding habits.
6.
Adjust operating idle speed.
7.
Tighten jets.
8.
Adjust float tab for correct fuel level.
9.
Clean and clear passages.
10. Replace needle or needle jet.
11. See Vacuum Piston Troubleshooting on page 4-4.
12. Clean, clear and correct as required.
13. Check and clean accelerator pump bypass orifice.
11. See Vacuum Piston Troubleshooting on page 4-4.
12. Clean, clear and correct as required.
13. Check and clean accelerator pump bypass orifice.
POOR ACCELERATION
Check for:
1.
Throttle cables misaligned.
2.
Inlet system air leak.
3.
Restricted fuel tank vent system.
4.
Restricted fuel supply passages.
5.
Plugged bowl vent or overflow.
6.
Enrichener valve not seated or leaking.
7.
Worn or damaged needle or needle jet.
8.
Vacuum piston malfunction.
9.
Plugged jets or passages.
10. Fuel level too low.
11. Accelerator pump leaking or no output.
11. Accelerator pump leaking or no output.
Remedy:
1.
Adjust throttle cables.
2.
Correct as required.
3.
Correct restricted hose. Replace vapor vent valve.
4.
Correct and clear restriction.
5.
Clean and clear passages.
6.
Adjust, clean or replace.
7.
Replace assembly.
8.
See Vacuum Piston Troubleshooting on page 4-4.
9.
Clean and clear as required.
10. Adjust float tab for correct fuel level.
11. Repair as necessary.
11. Repair as necessary.
HARD STARTING
Check for:
1.
Enrichener system plugged, not properly functioning or
improperly operated.
improperly operated.
2.
Inlet system air leak.
3.
Restricted fuel supply.
4.
Fuel overflow.
5.
Plugged slow jet or passages.
Remedy:
1.
Clean, adjust or replace; or read Owner’s Manual.
2.
Correct as required.
3.
Correct fuel supply or passages.
4.
See Overflow Troubleshooting on page 4-3.
5.
Clean, clear and correct as required.