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

🚤 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.

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

⚠️ Common Signs of 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

🔄 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

📦 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