I've been there myself! When I put the cylinder kit, carb and exhaust on mine, I ended up having to take it to a local scooter guy. It was something stupid! My throttle cable had to be modified for length to allow the slide in the new carb to fully drop down. Oh well, cost me $90, but he fixed it for me! I had been messing with it for a couple weeks and get it to run right, so it was worth it, plus I felt I was helping out a local mechanic and not a money grubbing shop!