I took the 250 off the trailer and checked the oil, looked over filled, knowing that I was going to change the oil after this run, my son took it out and went for a whole shot and said he could only get 40 mph....said there was also an oil looking smoke still in the air, this wasn't normal. I took the ski out next and got the same results, checked the oil and it was practically empty...why is this? Anyone have the same problems?