Yes, when you purchase a KTM 390 Duke 2018 motorcycle, it typically comes with a user's manual provided by the manufacturer. The user's manual contains important information about the motorcycle, including instructions on how to operate it, safety guidelines, maintenance procedures, and technical specifications. It is recommended to read the user's manual thoroughly before riding the motorcycle to ensure proper usage and to understand the features and capabilities of the bike. If you have purchased a used motorcycle and the user's manual is missing, you can contact a KTM dealer or visit the KTM website to obtain a digital or physical copy of the manual.