What is the smallest size engine for Harley Davidson?

The smallest engine Harley Davidson currently produces is the Revolution Max 750, which is used in the Harley-Davidson Bronx model. It displaces 750cc and is a liquid-cooled, 60-degree V-twin engine.

However, it's worth noting that Harley-Davidson used to produce even smaller engines in the past. The Sportster 883 had an 883cc engine, which was considered quite small for a Harley.

So, while the Revolution Max 750 is the smallest engine currently available, it's not the smallest engine Harley Davidson has ever made.