well maybe its true but i owne 4 shee i work for yamaha i do a lots of porting, i know a lot of people and shop personaly thats do porting on stock jug's and i never herd of thats much hp with a porting and pipe but maybe i am wrong, but on other company site they try to advertise as much hp as they can and no one advertise over 90 with porting and gas, with a full alchool set-up yes its possible , or else you need to change cylinder for after market one with power valve and etc etc you know!!! but again maybe i am wrong!!!!