Is a 140cc engine a 2 or 4stroke?

The displacement of an engine, such as 140cc, does not inherently determine whether it is a two-stroke or four-stroke engine. Both types of engines can have a 140cc displacement. The main difference lies in their operation: two-stroke engines complete a power cycle in two strokes of the piston, while four-stroke engines complete it in four strokes. Thus, you would need additional information to identify the specific type of engine.