Bill, you've got to stay off of that 650 site - those guys keep you wanting to build new things. Here's my favorite use of the classic Yamaha twin -
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Awww Man, I was saving that one for later.
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Not really, I had seen it but hadn't thought of posting it. A couple of years ago, I found a homemade "Riding Mower(although I never saw a deck on it) with a CB500 Four motor on it. Can't seem to find anything on it now!
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I've seen some pretty impressive builds on there too. I like our forums a lot better but, I like to browse once in a while to se what kind of stuff pops up there and if there are any ideas that might be used by me or anyone else.
Later on, Bill