Big bore kit

[jmj4ktm]

Hi guys, just wanted to get feedback on those that have upgraged their 250 exc-rfs engine year 04 to a big bore kit. How has engine wear and performance changed? Is there a kit that can turn the bike intona 400 or 450 cc? Thanks for your help

[bajadog]

I've read a lot of good things about this big bore kit
on Thumpertalk and KTMTalk.

Most 250 guys opt for the 355 kit not the 400.

http://www.ht-racing.com/355bigborek...ylinder-1.aspx