While major motorcycle manufacturers produce a wide range of impressive mainstream bikes, the custom-built world of motorcycles is far stranger, with some examples that seem to break all the rules.

A custom motorcycle combines diesel power, twin turbos, and all-wheel drive in an ambitious engineering project.

In a promotion for an American bacon producer, a diesel motorcycle has been specially adapted to ride on bacon fat. This “Wild Hog” is based on the rare Track T800 CDI motorcycle from Dutch company ...