How to Adjust the Carburetor on a Yamaha Road Star

by Justin Wash
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The carburetor on your Yamaha Road Star controls the amount of air and fuel that reaches the engine while the throttle is closed. This is what allows the engine to run when sitting still in neutral or with the clutch lever pulled in. If your carburetor is maladjusted however, this will not function correctly and the bike may die without the throttle open. Learn to adjust the idle of your Yamaha Road Star carburetor and ensure that your bike will always stay alive.

Step 1

Open the choke by pulling the choke lever on the left handlebar control toward you. Set the bike on its kickstand, put it in "Neutral" and start it up. Allow the Road Star to warm up for about 10 minutes before continuing with the adjustment procedure.

Step 2

Locate the idle adjustment screw on left side of the bike just below the rider's seat. Twist the adjuster screw clockwise one full turn. This will ensure the bike stays alive so you can adjust it to the proper setting.

Step 3

Close the choke lever and listen to the engine carefully. Twist the idle adjustment screw slowly counterclockwise. You should hear the engine speed start to slow.

Step 4

Twist the idle screw counterclockwise until you hear the engine start to sputter and die. When this happens, stop and turn the screw one half turn clockwise. Your bike should now be idling at the correct speed.

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