Harley-Davidson Ironhead engine

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1980 HD XLR Sportster with Ironhead Engine

Manufacturer	Harley-Davidson
Also called	XL
Production	1957 to 1985
Predecessor	Harley-Davidson KHK

The ironhead was a Harley-Davidson motorcycle engine, so named because of the composition of the cylinder heads (Iron instead of Aluminium). The engine is a two-cylinder, two valves per cylinder, pushrod V-twin. It was produced from 1957 until 1985 and was replaced by the Evolution engine in 1986.

This name was applied to the Harley-Davidson Sportster motorcycles that used this engine.