I had Gorr do a 295 kit for my YZ250 in 2009. At that time he was having Wiseco make specialty pistons (10788M07200) for him. After 120 hrs on the engine I needed a rebuild. Called Gorr and he told me Wiseco now makes a standard piston 878M07200 for this application built from Gorr's spec. It fits perfectly and I couldn't happier.