31116-ZY3-020 Honda Flywheel Boss | Genuine Used Part

🔧 Product Description

Genuine Honda V6 Flywheel Boss and Hub - Part Number: 31116-ZY3-020

A genuine used Honda flywheel boss used between the crankshaft and flywheel on selected BF175, BF200, BF225 and BF250 V6 outboards.

The boss centres and supports the flywheel on the crankshaft and provides the correctly machined mounting interface for the flywheel and associated oil-pump components. Honda BF225 and BF250D diagrams list 31116-ZY3-020 with their respective V6 flywheel assemblies.

⚙️ Key Features

• Genuine Honda flywheel boss

• Correct Honda reference 31116-ZY3-020

• Centres the flywheel on the crankshaft

• Used with selected ZY3, ZX2 and ZVL flywheels

• Suits Honda V6 outboard oil-pump and flywheel assemblies

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 31116-ZY3-020 later Honda flywheel-boss reference

• 31116-ZY3-000 earlier related flywheel-boss reference

OEM / Related Numbers:

• 31116-ZY3-020

• 31116ZY3020

• 31116-ZY3-000

• 31116ZY3000

• Flywheel: 31110-ZY3-000ZA

• Flywheel: 31110-ZX2-000ZA

• Flywheel: 31110-ZVL-B10

• Special bolt: 90002-ZW5-013

• Flywheel bolt: 90011-PH3-000

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Honda V6 flywheel assemblies

• Honda BF175, BF200, BF225 and BF250 oil-pump systems

• Engines using the 31116-ZY3 flywheel-hub family

Typically suits:

• Engine models:

• Honda BF175A and later BF175 variants

• Honda BF200A and later BF200 variants

• Honda BF225A and later BF225 variants

• Honda BF250A

• Honda BF250D

• Honda BF250DK1

• Honda BF250D UDS and URA

• Counter-rotation and digital-control variants whose flywheel diagram specifies 31116-ZY3-020

• HP Range: 175HP - 250HP

• Engine Type: Honda 3.5L and 3.6L V6 four-stroke EFI outboard

• Year Range: Approximately 2002 onward, dependent on flywheel specification

🔌 Function

The flywheel boss maintains concentric alignment between the crankshaft and flywheel and transfers crankshaft rotation into the flywheel assembly.

Common signs of failure:

• Flywheel does not seat squarely

• Excessive flywheel runout

• Damaged crankshaft or flywheel splines

• Worn or distorted mounting face

• Cracks around the bolt holes

• Abnormal vibration from the top of the engine

• Flywheel repeatedly loosens after installation

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated