Explore if a Harley-Davidson crate engine is the right upgrade for your bike. Review the cost and installation before modifying your motorcycle.

Harley-Davidson puts the Screamin' Eagle 135 Stage IV crate engine on a bench and gives us a glimpse at its inner workings ...

Harley-Davidson's Screamin' Eagle bikes stand out on the road. But what gives them their legendary status among riders? Find out what's so special about them.

Screamin’ Eagle® 135ci Stage IV Performance Crate Engine Componentry New 68mm throttle body and matching CNC-machined intake manifold, originally developed for Harley-Davidson Screamin’ Eagle factory ...