Replace your damaged or worn woodruff key with this premium-quality aftermarket replacement for Yamaha outboard engines. Manufactured to OEM specifications, this woodruff key provides a precise fit and reliable performance.

This key is used on a wide range of Yamaha outboard engines in various applications, including flywheels, water pump drive shafts and other engine components, depending on the model.

Replaces Yamaha Part Numbers

90280-04M04
90280-04M04-00

OEM part numbers are used for reference only.

Fits

Suitable for a wide range of Yamaha 2-stroke and 4-stroke outboard engines.

This woodruff key is used in various engine applications, depending on the model, including:

Flywheel
Water pump drive shaft
Engine drive components
Other applications using Yamaha part number 90280-04M04

Features

Premium-quality aftermarket replacement
Manufactured to OEM specifications
Precision-machined for an accurate fit
Corrosion-resistant steel construction
Direct replacement for the original part
Durable and reliable
Suitable for freshwater and saltwater use

Why Replace the Woodruff Key?

A damaged or sheared woodruff key may cause:

Incorrect ignition timing
Flywheel movement
Water pump drive issues
Difficulty starting
Reduced engine performance

Replacing a worn woodruff key helps maintain correct alignment and reliable engine operation.

Why Buy From SSI Marine?

Premium marine-grade aftermarket parts
Workshop-tested by SSI Marine
UK stock ready for immediate dispatch
Same working day dispatch before 1 PM (Monday–Friday)
Royal Mail Tracked 24 delivery
Technical support from experienced outboard specialists
Collection available from our Leigh, Manchester workshop

Buyer Responsibility

Please check your engine model, serial number and existing part number before ordering.

Although this key may look identical to others, Yamaha uses different sizes across its engine range.

If you are unsure, send us your engine model and serial number and we will be happy to confirm compatibility before purchase.

Yamaha Outboard Woodruff Key Replaces 90280-04M04 90280-04M04-00