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I have a 91 lt250r, I do not have an airbox so I'm running without one. I bought a 38mm carb. What jets should I be running in that carb, I can't seem to get any power out of it
 

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A 38mm is the right size for a motocross bike, all for top RPM power. An IT is rarely using top RPM power and so needs a smaller carb, something from 28mm to 32mm, to emphasize power at mid range RPM.
But no matter what carb you use there is a set sequence you need to follow to find the right jet sizes and the right tapered needle: www.dragonfly75.com/moto/carbtuning.html
 
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