| FAULT |
CAUSE |
CURE |
| Flooding |
1. Improper seating or damaged float needle valve or seat. |
1. Check and replace parts as necessary. |
| 2. Incorrect float level. |
2. Adjust float level. |
| 3. Fuel pump has excessive pressure. |
3. Check fuel pump. |
| Excessive fuel consumption |
1. Engine out of tune. |
1. Tune engine. |
| 2. Float level too high. |
2. Adjust float level. |
| 3. Loose plug or jet. |
3. Tighten plug or jet. |
| 4. Defective gasket. |
4. Replace gaskets. |
| 5. Fuel leaks at pipes or connections. |
5. Trace leak and rectify. |
| 6. Piston sticking. |
6. Check piston for free movement. |
| 7. Obstructed air bleed. |
7. Check and clear. |
| Stalling |
1. Jet obstructed. |
1. Clean jet assembly. |
| 2. Incorrect throttle opening. |
2. Adjust throttle. |
| 3. Idle mixture adjustment incorrect. |
3. Adjust idle mixture. |
| 4. Incorrect float level. |
4. Adjust float level. |
| Poor acceleration |
1. Incorrect mixture setting. |
1. Adjust carburettor mixture. |
| 2. Damper oil level incorrect. |
2. Top-up damper oil. |
| 3. Float level too low. |
3. Adjust float level. |
| 4. Incorrect throttle opening. |
4. Adjust throttle. |
| Spitting (backfire through carburettor) |
1. Weak Mixture. |
1. Clean and adjust carburettor. |
| 2. Incorrect ignition timing. |
2. Tune engine. |
| 3. Clogged fuel pipes. |
3. Clean or replace pipes. |
| 4. Inlet manifold leak. |
4. Check manifold/replace gasket. |
| Insufficient fuel supply |
1. Clogged carburettor. |
1. Dismantle and clean carburettor. |
| 2. Clogged fuel pipe. |
2. Clean fuel pipe. |
| 3. Dirty fuel. |
3. Clean fuel tank. |
| 4. Air in fuel system. |
4. Check connections and tighten. |
| 5. Defective fuel pump. |
5. Repair or replace fuel pump. |
| 6. Clogged fuel filter. |
6. Clean or replace filter. |
| Loss of fuel delivery |
1. Pump faulty. |
1. Replace pump. |
| 2. Blocked fuel filter. |
2. Clean/replace fuel filter. |
| 3. Diaphragm cracked. |
3. Replace fuel pump. |
| 4. Loose fuel pipe connections. |
4. Tighten fuel pipe connections. |
| 5. Defective valves. |
5. Replace valves. |
| 6. Cracked fuel pipes. |
6. Replace fuel pipes. |
| Noisy pump |
1. Loose pump mounting. |
1. Tighten mounting bolts. |
| 2. Worn or defective rocker arm (mechanical). |
2. Replace fuel pump. |
| 3. Broken rocker arm spring (mechanical). |
3. Replace fuel pump |
