just wondering if any one could tell me how i ended up with some type of a factory race cylinder that some kawi race team used? I sent my cylinder to kustom kraft to have it sleeved (just my personal preference) and they called me back and told me they have never seen a kx500 cylinder like this before and there is no sleeve that will match my ports partly because their are two extra exhaust ports that dont exist on any other kx500 and then he strarted to tell me that its a very very rare factory team race cylinder hes says that with confidence and certainty probably because he's seen over a hundred kx500 cylinders. So does anyone know were this cylinder came from or know anything about it?