Why Does Harley-Davidson's Milwaukee-Eight Engine Have Four Spark Plugs?

Why Does Harley-Davidson's Milwaukee-Eight Engine Have Four Spark Plugs?

March 22, 2026 at 11:45PM
staff@slashgear.com (Tom Clark)
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The Harley-Davidson Milwaukee-Eight was designed as a successor to the company's V-twin bike engines, and it features unique engineering like four spark plugs.

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