This service manual covers the 2010 Sportsman 300 and 400 HO all-terrain vehicles. Designed for a range of recreational and utility applications, these models are recognized for their robust engineering and reliable performance. The Sportsman series is known for its comfort, handling, and capability in various terrains, making it a versatile choice for both work and play. This manual provides essential information to ensure these vehicles operate at their peak potential. The purpose of this comprehensive manual is to guide owners, technicians, and mechanics through the maintenance, repair, and troubleshooting of the 2010 Sportsman 300 and 400 HO. It details key procedures, technical specifications, and important safety guidelines. By following the information contained within, users can effectively maintain their vehicles, perform necessary repairs, and ensure the longevity and optimal functioning of their Sportsman ATV.