Reply To: [How to Tutorial] How to Swap Upgrade Carb Main Jets Hyosung GT GT125R GV250 GV125 GT250R Dec 10, 2018 at 6:21 PM #2046 shane👤 Member Topics: 0Replies: 7 I will change the fuel lines as that’s all I can think is coursing the problem, I have lx spark plugs fitted already. I like the style of the bike but it will be in parts for ever if it carriers on annoying me!