4. Harley MT500/350
Source: bonhams
So, after World War II communications made such strides that wide-scale use of military motorcycles was completely unnecessary. However, Harley bought the rights to the popular Armstrong MT 500 British military motorcycle. They were favored due to their versatility, reliability and agility. Also, they were quite powerful. The one cylinder 482 cc four stroke engine put out a whopping 32 horse power. This meant the MT 500 gave an exhilarating ride. Yet, even at that the MT 500 experienced a very limited production run. Primarily, they were used for recon during Operation Desert Storm and troops in other locations around the globe. Their main drawback was the fuel. They use gas instead of diesel.