Clean!Vespas flagship model, the 2007 GTS 250ie, is a smooth number, whether you are cruising along in the summer sun, battling the traffic to work or on a weekend road trip on the open road. The 21hp, fuel injected, four-stroke motor is the most powerful engine that Vespa produces; it has strong consistent power perfect for overtaking and will easily out-accelerate most four-wheeled transport. The GTS also sits effortlessly at the speed limit on the open road. At idle it has a gentle lumpy throb due to the large single cylinder motor.