Well i've had some problems with the carb i fitted a Keihin PWK copy as it was a cheap one from thailand its no surprise. I don't think they suit vespas as the fuel pipe has to bend up in a loop as it meets the carb input pipe resulting in fuel starvation when low fuel in the tank. You could fit a pump but i was offerd a delorto/malossi kit form a good mate and have now fitted it which has fixed all my issues
