ok 1st of all I have followed this bike's service since it came in for the cam chain replacement, now I know for a fact that the bike was having problems which is why tim had it brought in, the conclusion after tearing down the top half of the motor was that the cam chain needed replaced as well as some of the top end parts. (as tim has stated) the noise then seemed to be coming from the bottom end after tim rode it back and forth to work... now me being a layman I would assume that maybe that problem existed before we replaced the cam chain, as rods don't just magically start knocking, and was maybe exasperated with the cam chain replacement which was masking the underlying problems... it'd be next to impossible to MAKE the problem appear while having the top end worked on... and yes I do pay attention to what the techs do, I ask questions when I don't understand something, and if something doesn't look or sound right I question it... if you had poor service you need to let the Management know about it... so that it can be rectified. If anyone has a bad experience they should let us know... as some here can attest I will do everything in my power to assure everyone is treated fairly and professionally.... that is the MOOSE guarantee...