0435123 Evinrude Johnson Gearset | Genuine OEM BRP Outboard Part

🔧 Product Description

Genuine BRP Evinrude Johnson V4 Forward Gear and Pinion Set - Part Number: 0435123

A genuine BRP matched forward-gear and pinion set for selected 90-degree V4 Evinrude and Johnson outboards with the large 4.750-inch "O" style gearcase.

The set uses a 12-tooth pinion and 27-tooth forward gear, producing a 2.25:1 overall gear ratio when installed with the correct matching gearcase components.

⚙️ Key Features

• Genuine BRP OEM matched gear set

• Correct OEM part number 0435123

• Forward gear and pinion configuration

• 12-tooth pinion

• 27-tooth forward gear

• 2.25:1 gear ratio

• Designed for the large V4 4.750-inch gearcase

• GLM and SEI replacement components available

🔄 Supersession & Cross Reference

OEM / Related Numbers:

• 0435123

• 435123

• 0778420

• 778420

• 0336574 - Matching reverse-gear reference in complete replacement sets

• 0337774 - Related clutch-dog reference

• 0914716 - Related gearcase component reference

• Gear Ratio Description: .44 / 12:27 / 2.25:1

Aftermarket / Verified Equivalents:

• SEI Marine: 91-306-03BK - complete 2.25:1 gear set

• GLM: 22651 - forward and pinion set

• GLM: 22653 - matching reverse gear

• GLM: 22625 - matching clutch dog

• Aftermarket V4 large "O" gearcase gear set replacing 0435123 and 0336574

🚤 Compatibility

Commonly used on:

• 90-degree V4 Evinrude and Johnson outboards

• Large 4.750-inch "O" type gearcases

• Standard-rotation applications using the 12/27-tooth gear set

Representative application period:

• Approximately 1978-2006

Representative horsepower families include selected:

• 85HP

• 88HP

• 90HP

• 100HP

• 110HP

• 112HP

• 115HP

• 120HP

• 125HP

• 130HP

• 135HP

• 140HP

Important fitment note:

• V4 engines were available with both large and small gearcases.

• Confirm the 4.750-inch bullet diameter and 12/27 tooth count.

• Counter-rotation gearcases use different gears.

• Forward and pinion gears are manufactured as a matched set and should not be mixed with worn unmatched components.

🔌 Function

The pinion transfers vertical driveshaft rotation to the forward gear, which drives the horizontal propeller shaft through the clutch dog.

Common signs of gearset failure:

• Gearcase whines or knocks

• Engine jumps out of gear

• Chipped or pitted gear teeth

• Metal debris on the drain plug

• Tooth faces show abnormal contact

• Excessive backlash

• Gear lubricant contains water

• Clutch dog and gear engagement lugs are rounded

Installation considerations:

• Replace matched gears together

• Inspect the reverse gear and clutch dog

• Replace damaged bearings and thrust washers

• Measure driveshaft and propeller-shaft runout

• Establish pinion height, gear backlash and end float

• Use the correct factory shimming tools

• Clean all metal debris from the housing

• Pressure- and vacuum-test the completed gearcase

• Fill with the specified high-performance gear lubricant

📦 Condition

• Genuine BRP Evinrude Johnson OEM part

• Brand new matched gear components

• Included components are limited to the OEM 0435123 assembly

• Supplied in genuine or equivalent protective packaging