d--n that was cool,, i glanced at this post a few minutes ago and went away to finish a show.came back in here to give an update, when i got back here to it, machine had touched on the exact thing i was going to mention.
i finally recieved/installed the 2 o-rings and large metal crush ring for the exhaust chamber, no more rattle.!!! appearently it was reverbing back and forth against the springs/ cylinder port. i reused the old o-rings/ brass washer, a month or so ago after the new piston went in. had an awesome ride in the hilly, washed out trails today. ,thanks , enjoy, jdv