Why does my 200 Arctic cat 440 Z, Fan Cooled, single carb sled run great when it is cold but when it warms up?

Carb is set to rich unless you are using the choke when it is cold, then the carb is set too lean. Be carefull about leaning it out, it is easy to burn a hole in a piston.|||I blew a piston a couple of years ago, I have had my mechanic adjust the carb, also replaced the crank seal, Any other suggestions?

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