I don't know if this is a "known issue" or not but thought it was worth mentioning. I justy picked up my '07 RSV (450 miles) from the Yamaha service department. I noticed a coolant drip from between the cylinders and brought 'er in. One of the heads needed to be re-torqued. As it was it was only a minor inconvenience but could have been worse if undiscovered or it got worse when I was away from home. Just thought I'd see if this had ever been an issue with anyone else.
Randy in PA