I had a similar failure on my 2007 M1000 last weekend. The lower rod bearing went on the pto side. Looks like it sent something up into to piston which subsequently caused to piston to become jammed gouging out the cylinder. The top half of the piston was stuffed up into the cylinder head. It bent the rod and I’m assuming that occurred when the piston became jammed in the cylinder and then that caused the piston skirts to come apart. Then at that moment in time the piston skirts went through the crank. The bent rod and remaining wrist pin beat the hell out of the cylinder wall. I was running a bdx oil delete kit installed per there instructions, and was also pre-mixing ams oil at 32:1. I have a hard time believing that the rod bearing wasn’t, getting enough oil because upon inspecting the outer and inner pto bearings on the crank, they had evidence of an abundance of oil in them. I would think that the lower rod bearing would be getting sufficient oil if the inner and outer crank bearings were receiving what appears to be adequate oil? The sled had about 1900 miles on it when it grenaded. I don’t believe that the bdx oil delete caused this but can’t help but have that doubt in the back of my mind. So not real sure if it was just time for the lower rod bearing to go or what? I’m just glad that the case halves didn’t get trashed when the hundreds of pieces of piston skirt went for a field trip through crank land.
