It's a beautiful day for riding but, curiosity has gotten the better of me today and I've been looking over the TTR parts bike. Upon further inspection, the oil drain plug was not fully seated which does explain the oil leak. Upon removal of the drain plug, however, I discovered thick milky oil! So she got a little bit of water in there at some point. Doesn't look too bad though, I don't see any signs of rust. Pulled the valve covers and everything looked nice and clean. Ordered a replacement shift shaft for $15 off the eBay. Then I replaced the stainless header with the factory TW200 pipe. I'll sell off the pipe and hopefully, be able to get this engine running while it's still in the TTR frame.