REVERSE PINION 66T-45571-00

Function and technical context

The reverse gear is the fundamental component of the rotation reversal system in Yamaha outboard motors. This gear works inside the gearbox, allowing the propeller to rotate in the opposite direction to the forward direction, which makes it possible to move the boat backwards and facilitates mooring and navigation maneuvers in small spaces. Its correct operation is critical for the safety of navigation, since a failure in this component completely eliminates the ability to reverse, compromising the maneuverability and control of the boat.

When to replace this part?

Symptoms of pinion wear include grinding noises or vibrations in the gearbox when engaging reverse gear, difficulty engaging or unintentional disengagement while cruising, and progressive loss of power in reverse gear. It is recommended that this component be inspected during each seasonal service, especially if changes in transmission behavior are detected. Replacing this pinion preventively at the first signs of wear avoids secondary damage to the gearbox and more expensive repairs that could render the boat inoperable.

Equivalent manufacturer part numbers