How to Clean Yamaha Carburetor

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Carburetors have been used in nearly every Yamaha motorcycle produced until the recent replacement by the electronic fuel-injection system on most newer models. The primary role of a carburetor is to provide an efficient ratio of air and fuel to the motor for combustion. Over time, fuel held within the carburetor begins to break down, turning into a sticky slime that clogs the internal passages and jets. Clogged jets can reduce performance, and at greater levels, cause the carburetor to fail. To remove the buildup, one must disassemble and clean the carburetor.

Things You'll Need

  • Notepad and pen
  • Bucket or container
  • Screwdrivers
  • Carburetor cleaner spray
  • Wire brushes
  • Metal cans, assorted sizes
  • Hot plate
  • Yamaha Carburetor Cleaner Dip (Yamaha part #ACC-CARBC-LE-NR)
  • Air compressor
  • Remove the carburetor(s) from the motorcycle. Place the carburetor(s) in a clear work space.

  • Place the carburetor over a bucket or container and remove the float bowl drain screw from the bottom of the carburetor and allow any fuel trapped in the float bowl to drain.

  • Disassemble the carburetor, removing the floats, choke, and jets. Take notes of the location and orientation of the various components as you remove them.

  • Remove the diaphragm, spring and needle from the top of the carburetor.

  • Spray the carburetor housing with carburetor cleaning spray and scrub clean with a wire brush. Clear the fuel passages by blowing compressed air through them.

  • Clear the jets by spraying with carburetor cleaner and passing a thin wire or a bristle from our wire brush through the jet. Follow up with compressed air to remove any debris.

  • Place the carburetor housing and any metal components into separate metal cans and cover with a 66:33 mixture of Yamaha Carburetor Dip and water. Place the can over a hot plate and allow the mixture to heat until it is about to boil. Let the parts sit in the heated mixture for 5 to 10 minutes, depending on the condition of the part.

  • Remove the carburetor and any parts that were dipped and allow to dry.

  • Reassemble the carburetor(s) and install on the motorcycle.

Tips & Warnings

  • To prevent fuel breakdown during extended periods of storage, add a fuel stabilizer to a full tank of fresh gasoline.
  • Replace the carburetor's gaskets if they show any signs of damage or deterioration.
  • Refer to a Yamaha factory service manual for instructions detailing carburetor removal, disassembly and installation.
  • If you do not feel you can complete this task, have the work performed by a qualified technician.

References

  • "The Professional Motorcycle Repair Program;" Professional Career Development Institute; 1995
  • Carb Cleaning 101; Motorcylist Retro Magazine; Spring 2008
  • Carburetors; Dan's Motorcycle
  • Photo Credit Jupiterimages/Comstock/Getty Images
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