I bought an XT 225 for my girlfriend about 3 months with only 7000K's on the clock here's a pic,
I have just taken the tiny snorkel out of the air box to get it breathing a bit better and it seems to be surging just a little in the higher rev range.
It seems to have heaps more pull with this mod but not so good up high, also its ok up high if you are steady on the throttle but just when you give it some.
I've been on xt225.com but havent posted there and I olny just found this thread so I thought i'd try here first.
I plan on doing that exhaust mod but thought I'd sort this out first and see how it goes once properly tuned.