How to Adjust a Kawasaki Carburetor

Updated March 23, 2017

Kawasaki motorcycle carburettors provide the fuel-and-air mixture necessary for the vehicle to produce its high performance. Tuning and adjusting the carburettor on such a motorcycle is the best way to get the most effective riding results from the bike. The adjustments can include making the idle, midrange, and high-range air-fuel mixing process more efficient or better suited to the environment the motorcycle is being ridden in. However, the process requires testing and retesting to get the carburettor settings correct for the rider and for the locale where he rides.

Insert the key into the ignition and start the motorcycle. Let the engine run for up to five minutes to warm the system. Turn the motorcycle off. Pull the clips that keep the engine cover on the bike body. Lift the cover to expose the engine and carburettor.

Turn the engine on again and let it settle into an idle. Position yourself to access the left side of the carburettor versus its ventral opening or the larger hole in the carburettor body. Locate the idle adjustment screw inserted into the carburettor side.

Insert a long flathead screwdriver into the top of the screw and turn it one-quarter of a clockwise screw turn. Listen to the engine idle while turning the idle adjuster screw. Continue to adjust by one-quarter turns until the engine idles smoothly as possible.

Turn the engine off again. Examine the carburettor body until you locate the high-range adjustment screw positioned at the carburettor body top. Again, adjust the screw by a one-quarter turn using a flathead screwdriver.

Place the motorbike on a support stand so that the rear wheel can spin freely without any contact. Confirm that the motorcycle will be stable and won't fall over as supported. Turn the engine on with the ignition key and start button. Begin to pull back on the throttle to raise the engine revolutions and speed output.

Let the engine run and idle for up to five minutes at the current speed with the throttle held in position. Turn the engine off. Adjust the high-range screw by a half turn, spinning it counterclockwise.

Restart the motorcycle engine and pull back on the throttle again to raise the speed. Examine the engine sound and adjust the high-range screw by one-quarter turns, taking note of how the engine sounds each time. Listen for bogging down (too much fuel) or increasing whine (too little fuel). Adjust until the engine runs at its optimum level before the whining increases due to the engine getting hotter.

Things You'll Need

  • Motorcycle ignition key
  • Flathead screwdriver
  • Motorcycle support stand
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About the Author

Since 2009 Tom Lutzenberger has written for various websites, covering topics ranging from finance to automotive history. Lutzenberger works in public finance and policy and consults on a variety of analytical services. His education includes a Bachelor of Arts in English and political science from Saint Mary's College and a Master of Business Administration in finance and marketing from California State University, Sacramento.