It is normal to have some climb in idle rpm as the bike warms. After i shut off the enrichener all the way (choke) and the bike is still cool having just run for a couple of minutes, it will idle around 1000rpm. After it warms up, it will vary from 1200-1400 rpm (give or take)- and there is nothing wrong with that. An idle up around 3000 rpm if everything is adjusted indicates a lean condition from adjustment, air leak or idle circuit passages being dirty. I would turn the idle mixture out to 3.5 turns, make sure there is free play on the throttle cable, good plugs properly gapped, just let it idle to warm, then use the idle air screw to adjust to 1200 rpm. If the idle still climbs too high, then check for air leaks. If there are none, the carbs need cleaning.

BTW- the idle air screw should have a spring on it which will prevent it from loosening, If not, get one. Also, if it is vibrating loose, the idle will get lower.

5 and 1 vents the carb float area! Drewpy, Dec 5, 2010. 16 OFallon, MO. Here's a diagram of the internal passages for these style of Mikuni's. Mikuni Motorcycle Carburetor Theory 101. Motorcycle carburetors look very complex, but with a little theory, you can tune your bike for maximum performance.

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