shovelhead open primary

A shovelhead open primary refers to a type of motorcycle primary drive system that does not use an enclosing cover or case to protect the primary chain and sprockets. Instead, the chain and sprockets are exposed to the elements and can be seen on the side of the motorcycle.

The term "shovelhead" refers to a specific type of Harley-Davidson engine that was produced from 1966 to 1985, which was characterized by its distinct shovel-shaped rocker covers. This type of engine was often used in chopper-style motorcycles, which were known for their customization and modification.

An open primary can provide several benefits for motorcycle enthusiasts, such as increased power transfer, improved performance, and a distinctive appearance. However, it can also be more challenging to maintain and requires regular cleaning and lubrication to prevent wear and damage to the components.

It's important to note that modifying a motorcycle's primary drive system can be complex and should only be done by experienced mechanics or professionals who understand the potential risks and safety concerns involved.