I got the machine basically for free with a blown engine. I rebuilt the engine, replaced crank, cylinder, piston and timing chain. It runs good and has a top speed of alittle over 40. It seems to me that the engine is a clone of a kodiak 450 efi, so i figured parts for them should work. I know it will never be fast being a 400 but wanted to get alittle more pulling power out of it.