last week i was at my regular riding spot when a dude came up with an 04 yfx with a curtis sparks exhaust, some type of metal intake with a k&n filter, and a modded cam... said the exhaust cam was moved one tooth wich matched up the same as the dirtbike, or something like that. i was pretty sure i had him on this one. i have raced yfz's before and never had problems walking away from him. he stompped me from the start all the way through. the only reason why i think he beat me is because i am still running my 13f/38r sprockets. i was in 5th gear before he was even in 3rd. idk, i couldnt tell really... that curtis sparks exhaust is loud. he was a pretty heavy dude... probably about the same as me. how did this happen? the only thing i could think was the gearing. my bike has been running pretty good... aside from a weird noise coming from my radiator area. i have a 15f sprocket, and my stock 14f. i decided to keep the 38r sprocket on instead of the 36r in case frosty's money ever decides to show up on my doorstep. i am thinking about trying the 15f/38r... does anyone know what it will do to my bike? the way it is running right now was perfect for the dunes, and i think that is the only way i will run it there from now on, but on this hard desert packed dirt, i am spinning out all the way to 5th. input would be greatly appreciated. and once again, i am keeping my 38r on.