6BY2 6BY2 Marine Gear / Stern-Drive Specifications Use the KMH50 marine gear or ZT350 or Mercruiser Bravo 1, 2 or 3 stern-drive with the 6BY2 series engine. WARNING! Fire Hazards. ZT350 and Bravo stern-drive power steering hoses must be routed away from hot engine components. Ensure the heat insulator is installed on the turbocharger. Note: See the marine gear / stern-drive manufacturers literature for additional information. 6BY2 - 4 Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) © 2009 Yanmar Marine International