Hey guys, so my buddy got an 84 atc 250r the other day. Thing is beyond rich and needed a couple things so I'm checking it out for him. It has a 36mm Mikuni TMX carb, some vintage race pipe and silencer, and an open lid air box. The kid we got it from jetted it up. I pulled the carb apart and it has a 390 main jet.. and stock is like 150 or something like that? What should he be running for this setup? I cant imagine a stock motor with a few things should be running a 390 lol.