I can buy a 440 kit for about 420 with a new head already set to go just have to put pistion in.http://cgi.ebay.com/ebaymotors...8562790QQcmdZViewItem. or i could buy a big bore kit for about 220 comes with everything just have to get it bored out.http://cgi.ebay.com/ebaymotors...531214QQcmdZViewItem.



How much would it be to get bored out? what would you do?

 

i think it would be cheaper and better to get the kit i got it and it works fine. it would make your 400ex a lot more reliable man

 

better as a kit plus easier

 

dude dont get the 440, there the most unreliable motors for a 400. get either e 426 or 416, i saw a 416 out there keepin up with 450s at some races i go to