How to Clean Carburetor on Lawn Mower: Fix Starting Problems

A dirty carburetor is a common cause of lawn mower starting and running problems. Learn how to safely clean your mower's carburetor to restore proper operation.

1-2 hours
advanced
year-round

Tools You'll Need

  • Socket wrench set
  • Screwdrivers
  • Carburetor cleaner
  • Compressed air
  • Safety gloves
  • Safety glasses

Materials

  • Carburetor cleaner spray
  • Clean rags
  • Small container for parts
  • Fresh fuel

Step-by-Step Instructions

1

Safety Preparation

Disconnect the spark plug wire and drain the fuel tank. Work in a well-ventilated area and wear safety equipment.

Pro Tips

  • Work outdoors or in well-ventilated area
  • Disconnect spark plug first
  • Drain fuel completely
2

Remove the Carburetor

Locate and remove the carburetor from the engine. Take photos of connections and note the orientation of parts.

Pro Tips

  • Take photos before disassembly
  • Note part orientation
  • Keep track of all screws and parts
3

Disassemble Carburetor

Carefully disassemble the carburetor, removing the bowl, float, needle valve, and jets. Soak metal parts in carburetor cleaner.

Pro Tips

  • Work on clean surface
  • Don't lose small parts
  • Soak parts for 30 minutes minimum
4

Clean All Parts

Use carburetor cleaner and compressed air to clean all passages, jets, and surfaces. Pay special attention to the main jet and idle jet.

Pro Tips

  • Clean all passages thoroughly
  • Use compressed air to dry
  • Check for damage or wear
5

Reassemble and Test

Reassemble the carburetor in reverse order and reinstall on the engine. Add fresh fuel and test the mower.

Pro Tips

  • Reassemble carefully
  • Use fresh fuel
  • Test in safe area

Frequently Asked Questions

How often should I clean my carburetor?

Clean annually or when you experience starting problems, rough running, or poor performance.

Can I use regular cleaner instead of carburetor cleaner?

No, use only carburetor cleaner as it's specifically formulated for this purpose and won't damage rubber parts.

What causes carburetor problems?

Old fuel, ethanol in gas, dirt, and lack of use are common causes of carburetor issues.

Should I replace or clean the carburetor?

Try cleaning first. Replace only if cleaning doesn't solve the problem or if parts are damaged.

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