I just got a cold air intake and a free flowing exhaust system. I will probably be running lean after this right? What adjustments should be made to the carb to compensate? It won't give me horrible gas mileage will it?

 

It will be fine at idle. it would only get lean in the upper RPMs.
When I put my cold air intake on my rex my emmisions did not change but when the guy started giving it more fuel the HC started to lean out. I may need to invest into some different carb jets the next time I have my carb rebuilt..
The best thing to do for now is run it rich at idle, (say 180 HC) so that it will lean out as you are getting after it, this will keep you from running to rick at idle and keep you from leaning out when you hit the upper RPMs.

 

so i just adjust the little adjustment screw on the carb? ok thanks. where can i find jets for a nikki carb anyway?

 

I think I saw some on Bictoria British's catologe.