I'm on my second engine. First engine was ticking at idle and coming from a Cali 1400 I did not really notice till a few weeks had passed. I took the bike in and they replace the hydraulic tensioners with no affect. Bike was only loud at idle and when cold, at about 140 F it quieted down and in all other respects was fine. In the meantime, I had a bad crash on the Cali and was out of the riding business for about eight months so there was no time pressure on the replacement which took about two months. Got the bike back changed the oil and filter after 600 miles and it's been great since. The dealer was helpful and responsive, so I have no issues there. I did expect to hear something about the findings but have not checked. I was in Deal's Gap last week and the MG experience group came by, and I asked the factory rep. He stated that they may send the engines back to Italy but they probable just can them - not real reassuring. Anyway, I'll go back to the dealer for the 6000 mile service and I'll post if there is any update. It could take a while since I've been riding my K1600GT on the long trips.