took my 02 rm250 to the local track again today, runing great all day. Untill all of a sudden out of no where, it started knocking/ ticking. I shut her down as fast as i could, what happend? Engine was rebuilt last summer and has been a very good dependable bike. Last i checked it had 135psi comp. May b a wrist pin came loose. All though i was pissed off,because i cant ride it anymore this summer. I was also happy it wasnt my 4 stroke. Witch would take a small loan to rebuild the 450 comparied to the 250 2t. I guess ill find out when i take her apart.