Well I️ got in a pinch early in the year and had to sell my 17 450FX but am getting a good deal on a 16 450F and thinking of making it an FX. Basically.. I️ have done little cross referencing and looks like cases are the same as far as EStart stuff goes. For Estart it’s basically bolt on components like flywheel,stator, cover.. etc. does anyone know the difference in crank? Is it just weight? Tranny isn’t a huge deal because I’ll prob run a rekluse. More just want the Estart & bigger radiators. It sucks yamaha don’t do an Estart kit like Honda does.