Carburetor Problems and Solutions

• 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

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