Reply To: [How to Tutorial] How to Swap Upgrade Carb Main Jets Hyosung GT GT125R GV250 GV125 GT250R Mar 2, 2021 at 8:36 PM #5591 Danny👤 Member Topics: 0Replies: 1 Hi on my hyosung gt125r 2007 I have a black widow full system exhaust and a k&n air filter with uprated pipes please could you tell me what size jets I need thank you