So i have a 1982 yamaha xj 650 with the YICS motor. I have been slowly working on this bike over the last winter. I rebuilt the carburetor and changed the oil and the rear end oil. However I cant seem to figure out why the bike immediately goes to 5k or better rpm when I first start it. I am getting very frustrated with this. I am part of the generation that didnt grow up with carburetor or even the likes of it. When I rebuilt the carburetor I did so with the Haynes manual. All of my float levels are perfect, my slides are in great shape, all jets are looking great cleaned them multiple times over. All of my idle air screws are set to 2.5 turns out due impart to having all stock jets. I broke the rack apart all of my seals are brand new. I am really at a complete loss as far as why this is happening. If someone could please help me. I would greatly appreciate it.