my friend rolled his 400ex over, probably sat for 40 seconds before we got it back over anything to be concerned about? Ran fine after. I had yhis happen to me before but it righted itself within a second and thiught nothing of it.

 

Some minor problems are possible; but, if he lost no crankcase or gear case lubricant through the vent hoses, and if he pumped none into his airbox/air intake filter, and spilled no appreciable amount of battery acid, no problem.

Diogenes