I have an 1988 and I am having a hard time with my throttle/ carb adjustment. I pulled started it and it bogged down a lot and even when i gave it throttle it died. It was if I had no throttle control or something. So I played with the idle screws on both carbs, and I just cant get it right. It wont idle, I have to keep it rev'd up. Could this be a jetting issue? or what? Please help!