These Roketa Scooters are powered by a 4-stroke engine for ultra smooth, efficient, and quiet transportation. 4-cycle engines are much quieter in operation than the 2-cycle engines found in most other brand scooters and much more environmental friendly. Roketa is also one of the best engineered gas motor scooters in its class. The Roketa brand scooters are the perfect choice for those looking for quick, easy and fun transportation at an incredibly affordable price and will also save you hundreds of dollars on gas.