hello i jsut joined here because i need some help on this blaster. i have rebuilt many of these but have never touched the carb. i bought a used clyinder that has a stock bore so this blaster is back to bone stock. all i know is the main jet is a 230 and the jet needle is on the 2nd groove. this setup the bike runs great. the question is what do i need to change on the carb if i install a bills pipe and bills silencer? also if i rode in the winter what would i need to change it to? i live in indiana about 800ft above sea level. any info would help. thanks