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Do It Yourself - Outdoor Power Equipment Repair & Maintenance

Carburetor Problems and Solutions

Carb Problems and Solutions Posted in Small Engines

The following is a chart of potential carburetor problems and possible remedies. This chart is intended to be a helpful guide when troubleshooting your carburetor. Each incident varies in accordance to individual use. Regular inspection of carburetor parts is recommended.

Always consult your owner's manual for speficic Carburetor tuning and recommendations.

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 adjustment
  • Engine will not start
  • Engine will not accelerate
  • Engine hunts (at idle or high speed)
  • Engine will not idle
  • Engine lacks power at high speed
  • Engine overspeeds
  • Engine starves for fuel at high speed (leans out)

Adjust main mixture adjustment screw; some models require finger tight adjustment

  • Carburetor out of adjustment
  • Engine will not start
  • Engine will not accelerate
  • Engine hunts (at idle or high speed)
  • Engine will not idle
  • Engine lacks power at high speed
  • Idle sped is excessive

Adjust idle mixture screw

  • Carburetor out of adjustment
  • Engine will not idle
  • Idle speed is excessive

Check for bent choke and throttle plates

  • Engine will not start
  • Engine hunts (at idle or high speed)
  • Engine will not idle
  • Engine overspeeds
  • Idle speed is excessive
  • Engine starves for fuel at high speed (leans out)

Adjust control cable or linage, to assure full choke and carburetor control

  • Carburetor out of adjustment
  • Engine will not start
  • Engine overspeeds

Clean carburetor after removing all non-metallic parts that are serviceable.

  • Carburetor floods
  • Engine starves for fuel at high speed (leans out)

Check inlet needle and seat for condition and proper installation

  • Carburtor leaks
  • Engine overspeeds
  • Idle speed is excessive

Check sealing of welch plugs, caps, plugs and gaskets

  • Carburetor out of adjustment
  • Engine will not idle
  • Engine lacks power at high speed
  • Carburetor leaks
  • Engine overspeeds

Adjust governor linkage

  • Engine hunts (at idle or high speed)
  • Engine will not idle
  • Engine lacks power at high speed
  • Carburtor floods
  • Engine 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 idle
  • Carburetor floods

Check float shaft for wear and float for leaks or dents

  • Engine will not start
  • Engine will not idle
  • Engine lacks power at high speed
  • Carburetor floods
  • Idle 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 speed
  • Carburtor floods
  • Idle speed is excessive
  • Engine starves for fuel at high speed (leans out)

Check sequence of gaskets and diaphragms for the particular carburetor being repaired


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