so i after i got my sled back from the mechanic about 1 1/2 hours of riding the one piston went, and just before that the dealer put in a new stator, so they are blaming the the piston on a air bubble that was in the oil line, is that possible? is it possible to take the stator out of a '07 800R without taking the engine out? and it was just ONE piston that went lean, so if it was a air bubble in the line wouldnt both pistons go instead of just one?