How to Rebuild a Mikuni Carburetor on a Yamaha Timberwolf 250

Written by kelvin hayes
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How to Rebuild a Mikuni Carburetor on a Yamaha Timberwolf 250
(Jupiterimages/Brand X Pictures/Getty Images)

The Yamaha Timberwolf 250 ATV carries a small bore, centre hung float style Mikuni carburettor attached to the air box and intake manifold. The rebuild process includes disassembling the carburettor, cleaning the interior chambers and replacing the gaskets. With this process complete, you'll have a carburettor that performs like new. Mikuni, a major manufacturer of ATV, dirt bike and small displacement engine carburettors, provides rebuild kits with gaskets and extra parts to ensure your rebuild goes smoothly.

Skill level:

Things you need

  • Screwdriver
  • Box wrench set
  • Carburettor cleaner
  • Mikuni carburettor rebuild kit

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  1. 1

    Unscrew the bolt at the bottom of the bowl, the lowest component of the carburettor. Pull the bowl and bowl bolt away from the bottom of the carburettor to reveal the metering block, where the jets are mounted.

  2. 2

    Unscrew the jets with a screwdriver.

  3. 3

    Spray the jets, bowl and upper body of the carburettor with carburettor cleaner spray to remove all fuel residue and debris. Re-insert the jets, tightening them until they are snug.

  4. 4

    Slip the bowl back onto the base of the carburettor, ensuring that you place a new bowl gasket between the bowl and carburettor base. This new gasket will seal the carburettor, a job that the gasket can only do once, so do not attempt to reuse the old gasket. Tighten the bowl bolt to complete the rebuild and cleaning process.

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