Hi All - I'm hoping someone might be able to give me some insight - I'm not much of a mechanic. I am trying to figure out where I am / was leaking oil out on my last run. I'm riding a 2004 YZF450. About mid-way through our run last weekend I noticed oil running down the inside of my frame underneath the radiator - it was also falling onto my pipe (the smell and light smoke as it burned caused me to discover it). The leak did not seem to be significant - wherever it was coming from - we had to run 20 miles back to the truck before we could leave - I checked the oil level at several stops and did not have a noticeable drop. The bike made it back fine - I ran it pretty hard (just wanted to get back) and did not have any noticeable drop in power. Myself and the guys I was riding with were a little perplexed - we could not locate where the oil came from. I took it back to town and used a pressure washer to clean the frame section where the oil was located to see if I could find a crack in the frame, then started the bike and let it run for some time. I could not find any cracks and no additional oil showed up. I don't want to destry the bike - if there is a problem, I'd like to figure out what it is and fix it before my next ride. Had anyone else ever had this problem? Are there any techies out there who can think of a good reason why I'd have oil down the frame on the bike?