2008 crf 250 engine build suggestions

[fish-d-fish]

We are building the crf 250 engine for this year in the trx. I have heard that over doing it can be easily done but also want all the power I can get from it. Who should I call or what are the best suggestions?

[ozborn1]

All this motor needs is good head work. Not sure your cc limits but the Athena big bore kit is a really nice bang for the buck.