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

PROBLEMPOSSIBLE SOLUTION
Engine hunts (at idle or high speed)Carburetor LeaksExamine 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 excessiveAdjust idle mixture screw
Carburetor out of adjustmentEngine will not idleIdle speed is excessiveCheck 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 overspeedsClean 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 excessiveCheck sealing of welch plugs, caps, plugs and gaskets
Carburetor out of adjustmentEngine will not idleEngine lacks power at high speedCarburetor leaksEngine overspeedsAdjust 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 excessiveCheck 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

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