Hi all I am new to this forum but have just yesterday purchased a new st-2 mp215 had one before but upgraded to a new blue one. When I got home and parked I noticed a inconsistent knocking from what seems to be drivers side of engine bay. As soon as you blip throttle it goes. I took it for a drive and stopped a few times and it wouldn't do it but got home and did it again. As I did 25k miles in my old st2 I am very familiar with the noise it should make and this isn't one of them it sounds like a loose pull or something like that. Don't think it's bottom end although does sound like that but it's too inconsistent to engine speed it seems.