hi, i have a yz426f 2001 and it came with a pro circuit t-f full exhaust system, header and silencer. i took the carb apart and found that my main jet size is a 162 which i think is the stock size, i am wondering if anyone knows what size jet i should put in with a full exhaust system. the reason i am asking about rejetting is because my friend has the same bike, but everything is stock and his front end will pull up in 4th gear very easily and mine wont. also if i quickely crank the throttle it will bogg for a split second and then go fast, but my friends doesnt. please help. thanks.