i just did the decomp mod with a hotcam's cam meant for the 02 426. i also added a fmf titanium 4 silencer. it started on the first kick, but there seemed to be added engine noise, like a ticking sort of sound, but it runs normal. also the headpipe glowed red. i went to the fmf website and it said to put a 165-168 main. i had a 170 lying around and installed that. it still glows. the website also says to turn the fuel screw out 2 1/2 turns out while factory is 1 1/4. where is this screw and would turning it out help? i understand it's running lean, but how do i fix it?