I have had a crank seal go bad berfore, but it was because I had a screw come loose in there and tear up the oil seal. Sorry to inform you but It can't be anything else besides your cases leaking. Either way you are going to have to split the cases, your top end is probably still just fine. May want to take a compression reading just to verify. If you can hold your hand like you said, a foot away, rev it, and be covered w/oil, it is definatlely tranny fluid. If you've never split the cases before, it will be a good learning experience for you. I prefer the factory manuals to the clymers. They are real expensive from yamaha, but Rocky mountain sells them cheap. Good luck!