Complete Yamaha Gear Set, 90 Degree V6 1.86:1

Product Details

This Complete Yamaha Gear Set, 90 Degree V6 1.86:1 is engineered for Yamaha 90° V6 2.6L 2-Stroke outboard engines with a 1.86:1 gear ratio. It is designed to fit standard rotation lower units on models manufactured from 1984 to 2012.

This serves as a direct cross-reference for SEI Marine part number 91-416-03BK and Yamaha OEM gear set 61H-45551-00-00/61H-45560-00-00.

• Designed for direct-fit installation.
• Built with marine-grade alloys for use in gasoline marine engines.
• Includes a complete forward and pinion gear assembly.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.

Engine & Model Compatibility

Confirm your engine model and year in the table below.

This gear set is compatible with a wide range of Yamaha V6 2.6L and VMAX series outboards from 1984 through 2012. Please verify your specific model and year for an exact match.

Technical Specs

Product Type

Complete Gear Set

Installation

Direct replacement

Fuel Type

Gasoline

Housing Material

Marine-grade alloy

Housing Color

Black

Product Dimensions

117.0 x 23.0 x 76.5

Gear Ratio

1.86:1

Rotation

Standard (Right Hand)

Compatible Lower Unit

V6 Yamaha 2.6 liter standard rotation

Warranty

1 Year

Replaces OEM Parts

61H-45551-00-00, 61H-45560-00-00

What’s in the Box

• 1x Forward Gear & Pinion Gear Set (61H-45551-00-00, 61H-45560-00-00)

Installation Notes

1. Drain the gearcase oil completely.
2. Remove the propeller and any related hardware.
3. Unbolt and carefully separate the lower unit from the upper engine housing.
4. Remove the bearing carrier and old gear set, taking careful note of the orientation of all shims, bearings, and seals.
5. Thoroughly clean the gearcase housing, removing any old lubricant and metal shavings.
6. Install the new gear set, ensuring it meshes correctly.
7. Check backlash and gear tooth contact patterns, adjusting shims as required per the original service manual.
8. Reassemble the lower unit with new seals and gaskets to prevent leaks.
9. Refill the gearcase with fresh, high-quality marine gear lubricant to the specified level.
10. Installation by a qualified marine mechanic is strongly recommended to ensure safety and correct operation.

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.