I was wondering what it takes to build a 300ex Race Bike, that will keep up with mildly modified 400ex's. What is needed for it to run with stock 400ex's? Any help given will be appreciated! Thanks! I will also try to help anyone who needs it, just ask.

 

um. u can but a 400ex motor into it....thats about it

 

Well a lot of threads have stuff about this, so searching is your best be. But I have a 406ex, and will be posting a webpage, with the whole project I did of it. Need to go back into the head, send it in for some work replace the cam, and a few other things than it should be done. Not sure how it really lines up against bikes yet. It hasn't been broken in all the way yet. Will be testing it against our raptor soon, and than test it after I do all the head work.

 

their is a 410 bore and stroker you can buy for the 300ex.

 

Where can you buy the 410 bore kit for it? How much does it cost?