What are the differences between a two-stroke and four-stroke vehicles?
“Two-stroke” engines burn the gas and lubricating oil together as part of the combustion process, which results in greater lower end torque, fewer moving parts and greater fuel efficiency. “Four-stroke” engines are more closely related to car engines, in that they keep the lubrication and fuel systems separate, which keeps emissions down considerably since there is no oil burned in the combustion process, unlike with “two-stroke” engines. Most modern scooters utilize four-stroke engines, though many modern scooters also use two-stroke engines, especially in 50cc models. One major disadvantage of four-stroke engines is that they are prone to overheating when run at maximum speed over several hours, leading to serious internal damage. Two-stroke engines do not have this limitation.
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