I had a rattle in my top end when I got my bike and at first I was using car oil after I found out about using the right oil it was already to late and the rattling only got worse over the next 2 years. then when I opened the motor up I found that the rocker arms had flat spots in them and so did the cam. I had to change them both after that on more rattling.

It sounds pretty similar to this:

http://www.youtube.com/watch?v=27UgpOTd3VI

Routy wrote on 06/07/13 at 03:58:56:


So that rattle is fairly normal? also, several people have mentioned the cam chain, and I've been meaning to check that. Everyone who has heard the noise says it sounds like its coming from too high up in the engine to be the cam chain.

hmmm... I was catching strange vibrations for a while and then I realized it was just a loose motor mount bolt, those that doesn't at all sound like it.
when Versy, Dane & i we're installing one of his new and improved cam chain adjusters, I believe I remember him saying that you would hear a hell of a lot of noise from the top end where the chain wraps around the cam when the stock adjusters about to come loose and tare up your motor.
  put a thick wrench, screwdriver or push rod to the spot between your temple and ear lobe and prod around the top end of your motor with the other end. you will better be able to hear inside your engine.

Routy wrote on 05/14/13 at 16:22:00:




Not 100% nice, but sure was funny ....

Ed wrote on 05/11/13 at 14:27:17:
that 5w30 will fry the clutch and definitely aint good for that motor id check the valves too just a suggestion