so i just got '06 xr650r, put in an initial break in of 550 miles, dirt and street. i do have the baja designs kit on. anyways after the break in i put in a stage 2 hot cam, full 2bros. exhaust, k&n filter, removed the airbox snorkel, and put the dyno jet kit in. so about 100 miles later i noticed coolant leaking out of the head at the gasket. checked the oil and there was coolant in the oil too. needless to say the bike is sitting at my shop awaiting a new head gasket on tues. so i was just wondering if anyone else has had anything like this happen to them. and why this might have happened. yes i am running it on the street, but i went up a tooth on the front sprocket. and its running at maybe mid rpms. HELP!!!!!!!!!!!!!