950 briggs barely fit in mbx10, almost 2fast Def 2 heavy,had cent clutch at first and thing would flip u easy.. I know I flipped when throttle stuck, so I got torq convert which tamed it,I need to weigh it, mini bikes are better when bike is light,this engine would be better in golf go carts ..it already ate a tire a chain wheel bearings sprocket.I even made it go 3/4 throttle so other s can ride it..950 series b&s 9.5 ft/lb torq..