YAMAHA TAIL 64D-45300-01-8D

Function and technical context

The tail is the transmission and propulsion assembly that houses the gearbox and propeller in outboard motors. In this case, it is a 90-degree V6 unit with a 1.86:1 reduction ratio, designed to deliver engine power to the propeller efficiently. This component works in the propulsion system, being responsible for transforming the revolutions of the crankshaft into the thrust necessary to move the boat. Its correct operation is critical: a damaged or worn tail can cause loss of traction, excessive vibrations, water entry into the housing and, in extreme cases, total failure of the outboard motor.

When to replace this part?

Symptoms of tail wear include abnormal vibrations while cruising, progressive power reduction, metallic noises in the gearbox, water entering the lower crankcase or excessive play in the drive shaft. Although there is no universal fixed maintenance interval, it is recommended that the integrity of the housing, couplings and retainers be inspected at each seasonal inspection, especially on heavily used vessels. Preventive replacement of a worn tail prevents costly emergency repairs on the water and ensures the operational safety of the boat.

Engine Compatibility Table

Equivalent manufacturer part numbers