Alfonze,
have you had any more diagnosis for your problem??
I have the exact same issue, a very loud rattle from about 800rpm - 1700rpm, which then goes away completely above 2000 rpm.
I am sure it is coming from the chain area, although it rattles badly at any time (cold or warm)
However it has been known to come and go - and it started all of a sudden, was fine one day - then rattling badly the next!!
Is it possible to just buy and hcange the tensioners etc - or does it have to be a complete chain kit??
How do i inspect the chain to properly diagnose?
Cheers guys,
Luke