I have a 95 300ex... i just replaced top end, i have a k&n, supertrapp pipe, and jetted carb, but it seems slower than when it was stock and new... what should i replace next?

 

Check the valve clearences. Also the cam could be worn down and not opening the valves all the way. also check the cam rockers. you may also want to change the sprocket ratios maybe go up 1 tooth on the countershaft front sprocket.