This manual covers the Yamaha 5MHU, a 2-stroke outboard motor designed for reliable performance. With a displacement of 85 cc and a power output of 4.0 kW (5.5 HP), this water-cooled engine utilizes a Mikuni VM15SH carburetor and requires a 25:1 premix lubrication ratio with unleaded gasoline. Its robust engineering ensures dependable operation for various marine applications.

This service manual provides comprehensive information for the maintenance and repair of your Yamaha 5MHU outboard motor. It details essential procedures, technical specifications, and troubleshooting guidance, covering aspects from ignition timing and spark plug gap to gear oil type and impeller replacement intervals. This resource is intended to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the unit.