thanks for the add, first time atc 250r owner but i did have the quad. the engine made a rattling noise on the quad so when i took Miss Ruby (my atc 250r) for a test ride i thought it was normal, i bought her about a week ago and have put about 25 hours on her, today while riding it suddenly bogged down and got a loud deep 4 stroke like sound and the knoching got worse to where it wont even idle i have took it aprt and it seem to bet the balancer bearing and it chewed the shaft apart> my question is i found a billet bearing set up by BDT are the better for the R and do they bolt on, also do i need a after market shaft or can i use oem shaft?? IMG]250r.jpg[/IMG]