[Merlin]

The air gas mix screw in hiding between the carb and cylinder on the bottom. You need to re-jet the carb and it will be fine. Most of us just get a Mikuni as there easier to work with and easier to get jets. To open your carb you will have to remove the tamper proof screws. Most people take a hacksaw and make a notch for a standard screwdriver. Once you get it dialed in every one seems to like the bike.