Desperate for someone to help. I own a yamaha aerox 50cc. Pretty standard bike, it does 50-55 generally. However, its not running great recently, acceleration is very poor, and inconsistant. I have a stage 6 replica exhaust which i bought, but then discovered, the bike needs to be upjetted to match the exhaust or something? With this exhaust on the bike wouldnt go over 30 mph. So i put my old standard exhaust back on. I dont know alot about bikes, but i need to sell it in a month or two as im getting a ktm duke 125. Could anyone tell me, how i would be able to match the carb to the exhaust so that it ran great and performed alot better? Any advice welcome!!