How to Adjust a Snowmobile Carburetor

Written by patrick nelson
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How to Adjust a Snowmobile Carburetor
Start the engine and allow it to warm up. (snowmobile 1 image by Przemyslaw Moranski from

You will find three carburettor adjustments necessary on a snowmobile--air screw adjustment, throttle slide adjustment and idle speed adjustment. Each adjustment has a specific purpose. For example, the idle speed should not be adjusted with the air screw. The throttle slide adjustment is necessary for proper throttle mechanism function. You can perform all of these adjustments with a few tools.

Skill level:

Things you need

  • Screwdrivers

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  1. 1

    Turn the engine off and completely close the air screw--it's on the side of the carburettor--until a slight resistance is felt, and then back off a little by turning it slightly in the opposite direction. Your manufacturer may specify an amount to back off.

  2. 2

    Unlock the throttle cable adjuster jam nut at the carburettor and press the throttle lever against the handle grip. You'll find the adjuster jam nut right on the throttle cable at the carburettor--where the throttle cable attaches. Turn the cable adjuster so that the carburettor slide is flush with the top of the carburettor bore. Tighten the adjuster nut again.

  3. 3

    Adjust the idle speed screw. It's often on the opposite side of the carburettor to the air screw. Turn the idle speed screw clockwise until it touches the throttle slide and then turn an additional two times. This is your start idle speed setting.

  4. 4

    Start the engine and allow it to warm up. Turn the idle speed screw clockwise or counter-clockwise until the engine speed is at 2000rpm, or revolutions per minute. You can read the engine speed on the tachometer on the dashboard.

Tips and warnings

  • Make sure the engine is off before adjusting the throttle slide.

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