Mercury - Quicksilver 835274Q1 Flo-Torq II Hub Kit Yamaha 150-300HP 4-Stroke & 115-250HP VMAX SHO Outboards 835274Q1. Overview. The Quicksilver 835274Q1 Flo-Torq II Hub Kit lets you run Mercury or Quicksilver propellers on your Yamaha 150-300HP 4-stroke or 115-250HP VMAX SHO outboard, giving you smoother performance and protection from drivetrain damage.. The Flo-Torq II system is known for its durability and flexibility - it cushions prop impacts, helps prevent gearcase damage, and can be servi