Hey guys, i just installed a Jardine RT 4 exhaust system on my 03 yz 450f and as i had expected there is a pretty bad backfire on the decel. Now im not an expert by any means with the mechanical side of bikes, but i knew that i had to adjust the fuel screw in some way. 1) What kind of bolt is in that hole cause i cant see in there so i dont know what kind of tool to use to adjust it? 2) Which way should i turn it because im trying to make the mixture richer, correct? Any help would be greatly appreciated.