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engines such as lawnmowers, weed trimmers and chainsaws.

Intake over exhaust (IOE) engines

Intake Over Exhaust (IOE) engines combined elements of the sidevalve and overhead valve designs. Used extensively in American motorcycles in the early 1900s, the IOE engine remained in production in limited numbers until the 1990s. IOE engines are more efficient than sidevalve engines, but also more complex, larger and more expensive to manufacture.

Overhead engines (OHV & OHC)

In an

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