This a a short video on how to properly tune a Keihin Butterfly carb or Mikuni Butterfly style carburetor. The butterfly carbs made my Keihin and Mikuni are almost identical. The following tips will help to eliminate carb flooding, carb running rich, and carb running lean The following carb tuning tips apply to both brands.

Step 1 clean your carburetor.
Step 2 set your float level to within manufacturers specs.
Step 3 set your pilot air fuel mix screw air 1 1/4 turns from gently seated.
Step 4 warm your engine to normal running temps.
Step 5 set your idle speed screw so your idle is just above 2000 rpm.
Step 6 slowly rotate air fuel mixture screw COUNTERCLOCKWISE leaning out the mixture until highest idle is achieved.
Step 7 Screw your idle speed screw counterclockwise to obtain desired idle speed.(Yamaha Bravo 250=1100 rpm)
Step 8 RIDE IT LIKE YOU STOLE IT ;)

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