I have a 1991 Tomos Bullet with an A3. I switched the stock dellorto with a 15.15 SHA and added a Techno Bullet pipe. The Stock carb had a 56 main and the new 15.15 has a 68. When I crank her up, she will rev up and idle really high. Which scares me! Idle screw is turned out and throttle cable is not pinched or stuck. It performs poorly aswell and pulls itself on idle. Is the 68 jet causing this high idle and giving it too much gas? What would be a proper jet to try?