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I have a 1992 kdx 250 I wanna know all the things I can do to get more power (carb mods , head milling, reeds , and who is the best to seen my cylinder off to to get it ported and polished and best exhaust

Your parts are pretty interchangeable with kx250 bits of similar year. The head and base gasket make a difference, from what I'm told. Cheap and quick. If you still need more, you can use a kx flywheel. That kdx250 engine has gobs and gobs of usable power though, i would focus on getting the bike setup suspension wise first. Make sure the engine is solid and serviceable, and the bike is smooth, tuned, and right. Using the power a stock kdx 250 motor throws out is impossible if the bike isn't set up correctly, and that takes work. Once you can actually use the power the bike has, if you still want more power, then you can look at modding. Just my humble opinion, of course....

I have all aftermarket shocks and it is tuned just ab at its best I am looking good aftermarket parts to give it some power now

Curious why you felt you needed to start another thread asking the same question? http://kdxrider.net/forums/viewtopic.php?f=134&t=13896