So, after putting in a fresh air filter I was doing a quick check of my bike since I have ridden it a number of times without a washing and I wanted to make sure everything was tight. Low and behold I see the main bolt that holds the subframe to the frame is not there. I was puzzled because there was no bolt but I wasn't seeing any light through the hole. I grabbed a flashlight (ya, it is almost 9pm on a Sunday night) and I see the threaded portion of the bolt is still threaded in the subframe but the rest of the bolt is gone! I don't know how long it has been like that but I guess I shouldn't ride it until I fix it... Has this happen to anyone else? I did mod the bike to fit the plastic of an '03-'05 450 which included a subframe from a newer bike but I can't think of anything in the mod that would cause extra stress on that bolt.