So, I moved away for a year and left my UM Xpeed chained up at a friend's aparment. When I came back I figured it could use a good once-over and pushed down to a new repair shop that opened in my area. Three-hundred bucks later, and I have a scooter that now has a lot of problems.

The biggest one is that it tops out at 10 or 15 MPH. It ran fine at first, but when I was accelerating, the engine would sometimes stall out for a few seconds. It was annoying, but I kept riding it. As time went on, it would stall more often, making it harder and harder to get that point where the variator spins up and you accelerate up to cruising speed. It's finally gotten to the point where it stalls before I get much speed built up at all, and I'm stuck going 10 MPH, even downhill, with an engine stalling every few seconds.

This scooter is my only means of transportation, and I don't have enough money to take back to the shop that possible broke it in the first place. Can somebody give me an idea of where to start diagnosing this problem?