Yamaha 40HP 50HP 2-Stroke Power Trim Tilt Motor 12V 4-Bolt

Yamaha 40HP 50HP 2-Stroke Power Trim Tilt Motor 12V 4-Bolt

Overview

Aftermarket reversible 12V power trim and tilt motor for selected Yamaha 40HP and 50HP three-cylinder two-stroke outboards. It has a two-wire connection, four-bolt mounting flange and 11mm drive shaft, and must be matched against the original hydraulic trim assembly before purchase.

Engine compatibility and OEM references

• Yamaha 40HP two-stroke, three-cylinder: selected 1985-1994 applications.
• Yamaha 50HP two-stroke, three-cylinder: selected 1985-1992 applications.
• Yamaha C40 / commercial series: selected 1992-1997 applications only where the original motor and trim assembly match.

Yamaha references to compare: 6H5-43880-02-00, 6H5-43880-01-00 and 6H5-43880-00-00.

Confirm the complete engine model and serial number, original motor reference, two-wire system, four-bolt flange and 11mm drive. Year and horsepower alone are not sufficient.

Installation and pre-fit checks

• Support the outboard, disconnect the battery and relieve trim-system pressure before removal.
• Compare the old motor's wires, ring terminals, bolt pattern, shaft diameter, shaft coupling and housing profile.
• Check trim relays, battery voltage, cable condition, earth path and hydraulic-pump freedom before installing a new motor.
• Replace the seal, clean the mating face and tighten the four mounting bolts evenly to Yamaha specifications.
• Refill and bleed with the specified trim fluid, then test full travel in both directions while checking for leaks and excessive current draw.

Questions & Answers

Q1. Does it fit every Yamaha 40HP or 50HP outboard?
No. It is for selected three-cylinder two-stroke applications with the matching OEM reference, two-wire system and four-bolt flange.

Q2. Is the hydraulic pump included?
No. This listing is for the reversible electric trim motor only.

Q3. What physical measurements should I compare?
Confirm the four-bolt pattern, approximately 11mm drive shaft, coupling shape, housing profile and electrical terminals.

Q4. Why must the relays and hydraulic pump be checked?
A faulty relay, weak supply or seized pump can stop the trim system and may overload a new motor even when the original motor appears to have failed.