How to Change the Air Fuel Mixture on a Yamaha Grizzly


The gas and air mixture on a Yamaha Grizzly is controlled by a small screw on the lower front right side of the carburetor. This screw is larger then the jet pins and is in clear view. You will need the owner's manual for your Grizzly, because it has a chart on the back that will tell you how many turns you need to twist the screw. Almost any Yamaha Grizzly owner can do this with a basic tool.

Things You'll Need

  • Owner's manual
  • Flat head screwdriver
  • Park the Grizzly and turn the engine off. Allow the carburetor and engine to completely cool before proceeding to avoid serious burns.

  • Open the owner's manual and look at the adjustment chart toward the rear of the manual. Match up your altitude and engine size on the chart.

  • Turn the screw, using a screwdriver, clockwise until it stops and is snug. Then turn the screw as many time counterclockwise as the chart indicates. Start the engine and allow it to run for five minutes to adjust to the new mixture.


  • "Yamaha Kodiak & Grizzly ATVs: 2-Wheel Drive and 4-Wheel Drive 1993 to 2005 (Owners Workshop Manual)"; Alan Ahlstrand; 2004
  • Photo Credit blue 4-weeler image by Yermashkevich Pavel from
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