Erm, of course. But if it really was on its side, it should never have continued to run. From what I've been told, the oil distribution system really isn't made for that, to such an extent that damage could occur in as little as 10 seconds. That's why there's a tilt sensor that's supposed to cut the engine if the bike leans over a certain angle. I know I've tipped mine at what I think was less than 45º.