Did the "free mods" a while back to the 426. You guys were right, it's a night and day difference. After beating a cr 250 on my "old mans enduro bike" I'm all smiles. Pulled the light blue wire,grey wire, yz throttle stop, removed the air box snorkle, run a gytr exhaust insert or no baffle at all. I'm too chicken to try the bk mod. How often does everyone change there oil? In miles please? And after doing a search check my vlaves after 1000 miles?