carburetor problems and solutions –
by Jack’s small engine and generator service LLC
Regular inspection of carburetor parts is recommended.
Always consult your owner’s manual for specific Carburetor tuning and recommendations.
Check float shaft for wear and float for leaks or dents
| PROBLEM | POSSIBLE SOLUTION |
| Engine hunts (at idle or high speed)Carburetor Leaks | Examine idle and main mixture adjustment screws and O-Rings for cracks and damage. |
| Carburetor out of adjustmentEngine will not startEngine will not accelerateEngine hunts (at idle or high speed)Engine will not idleEngine lacks power at high speedEngine overspeedsEngine starves for fuel at high speed (leans out) | Adjust main mixture adjustment screw; some models require finger tight adjustment |
| Carburetor out of adjustmentEngine will not startEngine will not accelerateEngine hunts (at idle or high speed)Engine will not idleEngine lacks power at high speedIdle sped is excessive | Adjust idle mixture screw |
| Carburetor out of adjustmentEngine will not idleIdle speed is excessive | Check for bent choke and throttle plates |
| Engine will not startEngine hunts (at idle or high speed)Engine will not idleEngine overspeedsIdle speed is excessiveEngine starves for fuel at high speed (leans out) | Adjust control cable or linage, to assure full choke and carburetor control |
| Carburetor out of adjustmentEngine will not startEngine overspeeds | Clean carburetor after removing all non-metallic parts that are serviceable. |
| Carburetor floodsEngine starves for fuel at high speed (leans out) | Check inlet needle and seat for condition and proper installation |
| Carburtor leaksEngine overspeedsIdle speed is excessive | Check sealing of welch plugs, caps, plugs and gaskets |
| Carburetor out of adjustmentEngine will not idleEngine lacks power at high speedCarburetor leaksEngine overspeeds | Adjust governor linkage< |
| Engine hunts (at idle or high speed)Engine will not idleEngine lacks power at high speedCarburtor floodsEngine starves for fuel at high speed (leans out) | Adjust float settings if float type carburetor |
| Engine hunts (at idle or high speed)Engine will not idleCarburetor floods | |
| Engine will not startEngine will not idleEngine lacks power at high speedCarburetor floodsIdle speed is excessive | Check diaphragm for cracks or distortion and check nylon check ball for function if available |
| Engine hunts (at idle or high speed)Engine lacks power at high speedCarburetor floodsIdle speed is excessiveEngine starves for fuel at high speed (leans out) | Check sequence of gaskets and diaphragms for the particular carburetor being repaired |
Add comment