Harley-Davidson motorcycles have traditionally been known for their V-twin engines, which typically have two cylinders arranged in a V-shaped configuration. However, Harley-Davidson has also produced motorcycles with other engine configurations over the years, including single-cylinder and inline (or parallel) twin engines. It's important to note that Harley-Davidson's lineup of motorcycles can vary, and different models may feature different engine configurations.
Therefore, the number of cylinders in a Harley-Davidson motorcycle engine can vary depending on the specific model and year. It is advisable to check the specifications of the particular Harley-Davidson model you are interested in for accurate information on the engine configuration and cylinder count.