jetted

Hello All, I am new to the forum and have purchased a clean 97cc DB30 for my son for Christmas this year. He is 8 and has never ridden before, so I prefer to leave the 97cc on it for now. I have installed a jackshaft kit, new plug, green clutch spring, and cleaned the carb. It starts and...

I jetted my stock Predator today. Used a number .037 main jet and a 140 Emulsion tube. It starts and runs but it runs very rough and seems like it's running way too rich. I switched back to the stock jets for now but how would I solve this problem? Would I have to replace the air filter and exhaust?