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To achieve this, it is first passed through the air filter where any potentially harmful particles and debris (think small pieces of leaves, for example) are removed. Although there are many parts that are needed to do this, it all starts with the crankshaft. In engines, oil is used to lubricate the moving parts within the engine. A two-stroke engine found on a motorcycle is water-cooled. From the options below, pick the number of cylinders that correspond to the number found in a small gasoline engine.

An almost perfect example of a small gasoline engine would be the one found in your fuel-driven lawn mower. Small engines have not only powered some of the most iconic cars ever designed -- and there are a few that immediately spring to mind -- they also are the go-to powerplant for many other pieces of machinery. Place dolphin pieces A, B, and C face down on paper. Drawers, cubbies, shelving -- whatever you need to put everything in its right place. You would put whole beans into the canister, then crank the handle to work the grinder.