I have a 3 year old GV and I ride it all year round, this winter as I was coming home it starting making a noise that sounds metalic. I took it in to the dealer and he believes that I am loosing the crankshaft bearing. I had synthetic oil in it and always change the oil at 5000 mile. Was wondering if anyone eles that has a GV has ever experienced this or heard of it?
Maybe your cam chain is also stretched and is flapping around in the crank case.