A Harley-Davidson Stage 2 upgrade involves a new camshaft plus all Stage 1 upgrades. It can cost $1,500 and up, although kits ...

With production largely shut down on account of the coronavirus pandemic, Harley-Davidson found enough resources to announce this week the introduction of new engine upgrade kits for Screamin ...

Harley's most powerful crate engine packs serious muscle. Find out what makes it a game-changer for performance and ...

We get from this Harley upgrade range a 103 stroker kit that brings the engine to 1,690cc, a quick adjustable pushrod, and the 6-speed overdrive transmission.

Harley-Davidson motorcycles are iconic. These highly customizable bikes can be upgraded for several times -- what do you get out of a Stage 4 upgrade?