| The chart that follows will give you a check list of troubles most likely to show up in a carburetor, together with their remedies. Always make sure first, however, that the difficulty does not lie in the pump or fuel lines. |
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Finding and Fixing Troubles in the Carburetor
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Sympton and Probable Causes
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Remedy
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| Poor Idling |
| Idle air bleed cabonized |
Dissassemble carburetor. Soak air bleed in suitable solvent. Clear with compressed air. |
| Idle discharge holes plugged |
Soak main and throttle bodies in suitable solvent. Clear with compressed air. |
| Throttle body carbonized, shaft worn |
Check for wear; replace if necessary |
| Damaged or worn idle-mixture needle |
Replace needle, adjust air mixture |
| Incorrect fuel level |
Adjust to correct float level |
| Carburetor Floods or Leaks |
| Cracked body |
Replace body. Tighten screws |
| Defective body gaskets |
Replace defective gaskets, check for leak. |
| High float level |
Correct float level |
| Worn needle valve and seat |
Clean and inspect needle valve and seat |
| Excessive fuel pump pressure |
Test pressure, if necessary, replace. |
| Poor Acceleration |
| Accelerator pump by-pass corroded |
Clean and inspect; replace if necessary |
| Accelerator pump faulty |
Clean and inspect; replace if necessary |
| Incorrect fuel level |
Correct fuel level |
| Automatic choke not operating properly |
Clean and inspect; replace if necessary |
| Heat-control valve stuck |
Free up stuck manifold valve. |
| Poor Performance |
| Restricted air cleaner |
Remove and clean |
| Excess oil in air cleaner |
Remove, clean, and refill to proper level. |
| Leaking float |
Replace leaking float. Check level. |
| High float level |
Correct float level. |
| Excessive fuel pump pressure |
Replace fuel pump assembly |
| Worn metering jet |
Replace jet |
| Choke heat tube opening plugged |
Remove choke heat tube, drill out. |