I now own two Voyagers I have had several over the years, really like that bike. I was planning on selling one but it must have gotten wind that I'm planning to send it to a new home because it developed an intermittent knock which sounds like it's coming out of the crank case. It's more of a tap really not a knock. I've had it into two shops so far and at first they can't hear it. Then over a period of several days and several starts it shows up. Sometimes very slightly and sometimes it's distinct. But nobody can put a finger on what it is. It's very expensive to take it out and split it open just to look. Does anyone have any experience with this? Bike has just under 25k miles.