The Kubota RT100 is a horizontal, water-cooled, four cycle diesel engine. With a capacity of 10HP at 2400RPM, the Kubota RT100 is renowned for its reliability and durability Renowned for their reliability and durability, the Kubota RT Series features horizontal, water-cooled, 4-cycle diesel engines from 10 to 14HP. Built with the user and environment in mind, the Kubota RT Series is durable and fuel efficient, while reducing emissions and environmental impact.