Is a 140cc engine 2 or 4stroke?

140cc engines generally refer to the displacement of the engine, which can be found in either 2-stroke or 4-stroke versions. Both 2-stroke and 4-stroke engines can have a variety of displacements, including 140cc. If you don't have more information or context, such as the specific make or model of the engine, I cannot determine whether a 140cc engine is 2 or 4-stroke. You may need to research further or provide more details to know whether it is a 2-stroke or 4-stroke engine.