Tofay while moving from one spot on the lake to another while on plane at around 40 mph, my motor started to bog down then died. There were no alarms, the pee stream was good, but it wouldn't start again. After multiple attempts it finally started but was running like crap. I idled maybe 200 yards before it died again. My brother who was also on the lake came and towed me back to the ramp. After getting the boats out of the water we took the cowling off and the air intake off. The bottom cylinder on the starboard side had oil in it as well as pooling oil in the bottom of the starboard side of the air intake. It was still the bluish color which tells me that it was unburned oil. Any ideas what caused this?