Mercury - Quicksilver 835257Q6 Flo-Torq II Hub Kit with Bushing Mercury 135HP+ Outboards (Surfacing Applications) 835257Q6. Overview. When you're running a big motor and pushing high speeds, you need parts that can take a beating. The Quicksilver 835257Q6 Flo-Torq II Hub Kit is built for Mercury 135HP and larger outboards that use surfacing prop setups - the kind of applications where the prop leaves the water and comes back under full power.. This hub takes the shock out of every hit, protectin