What is the main purpose of this starter shaft gear?

This starter shaft gear is a replacement part for the original gear found in the starter system of 4-speed Big Twin Harley-Davidson motorcycles. It engages with the starter motor to turn the engine over.

What does 'black oxide-coated and heat-treated' mean for this gear?

The black oxide coating helps protect the gear from corrosion, while the heat-treatment process makes the metal harder and stronger. Together, these treatments help ensure the gear can withstand the forces involved in starting your engine.

Does this gear come with any mounting hardware?

This product listing is for the starter shaft gear only. Any necessary mounting hardware or related starter components would need to be purchased separately.

Twin Power 65-85 Big Twin With Chain 4 Speed Starter Shaft Gear Replaces H-D 31485-65

Specifications

Brand: TwinPower
Part #: 215622
UPC: 887337164519

Twin Power 65-85 Big Twin With Chain 4 Speed Starter Shaft Gear Replaces H-D 31485-65

Name: Twin Power 65-85 Big Twin With Chain 4 Speed Starter Shaft Gear Replaces H-D 31485-65
Brand: TwinPower
SKU: twinpower-twin-power-65-85-big-twin-with-chain-4-speed-starter-shaft-gear-replac-t14-610474
Price: 22.52 USD
Availability: BackOrder

$22.52

On Backorder — Expected to ship by May 31, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Twin Power starter shaft gear for 1965-1985 Harley-Davidson Big Twins with chain drive. Replaces H-D 31485-65.

Key Features

Fits 1965-1985 Harley-Davidson Big Twin models with 4-speed transmissions and rear chain drive.
Replaces Harley-Davidson part number 31485-65.
Features a black oxide coating for durability.
Heat-treated for maximum strength.
Designed for reliable starter engagement.

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Will this fit your vehicle?

Product Details

This Twin Power starter shaft gear is what you get when you need to replace the original on your 4-speed Big Twin Harley-Davidson with rear chain drive. It's built to replace Harley-Davidson part number 31485-65, fitting a range of models from 1965 through 1985.

The gear itself is black oxide-coated and heat-treated. This process helps make it strong, so it can handle the demands of starting your engine reliably. It's a well-built component designed to give you good performance for this specific application.