piston and cam

[dempsey400]

I have a 400ex pretty much stock except for a wb e series slip on and kn filter and dynojet kit, and airbox lid removed. I ride pretty much in all kinds of places. sand, mx tracks and trails. what bore should i use also compression and piston brand. i want a hotcam but not sure which one. will the stage 2 kill my bottom end? Id still like to have decent bottom end. Will a stage 1 make much difference? id like to outrun suzukis. thanks.

[H_W]

I would recommend a 416 kit with about a 10.8 to 1 comp piston and a hotcam stage 2. With my standard bore 10.5 to 1 comp piston and hotcam stage 2, my bottom end is about the same as stock but my mid range and top end are awesome.

[RED121572]

Question is, how much money do you have? lol

If money is not a concern, Id say go big. 426-435-440. Use nothing less than a 13.1 compression piston. Also, throw in a high end cam. Maybe some port and polishing.

Talk to KFulk, I believe hes building a 460 gernade motor. ;)