90280-04M04 Yamaha Woodruff Key | Genuine OEM Yamaha Outboard Part
90280-04M04 Yamaha Woodruff Key | Genuine OEM Yamaha Outboard Part
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🔧 Product Description
Genuine Yamaha 4mm Woodruff Key - Part Number: 90280-04M04
A genuine Yamaha semicircular shaft key used in selected water-pump, flywheel and timing-drive assemblies.
The key locates the driven component on its shaft and transfers rotational force while maintaining accurate angular alignment.
⚙️ Key Features
- Genuine Yamaha OEM woodruff key
- Correct Yamaha part number 90280-04M04
- Precision-machined semicircular profile
- Used in selected mid-range outboard shaft assemblies
- Direct aftermarket replacement keys available
🚤 Compatibility
Commonly used on
- Yamaha water-pump impeller drives
- Selected flywheel and timing-pulley shaft connections
Typically suits
- Engine models:
- Yamaha 50HP two-stroke
- Yamaha 60HP two-stroke
- Yamaha 70HP two-stroke
- Yamaha 75HP two-stroke
- Yamaha 80HP two-stroke
- Yamaha 85HP two-stroke
- Yamaha 90HP two-stroke
- Yamaha F75 four-stroke
- Yamaha F80A and F80B four-stroke
- Yamaha F90 four-stroke
- Yamaha F100A and F100D four-stroke
- Assemblies whose parts diagram specifies woodruff key 90280-04M04
- HP Range: Approximately 50HP - 100HP
- Engine Type: Yamaha two-stroke and four-stroke outboard
- Year Range: Assembly and shaft controlled.
🔌 Function
The key locks the impeller, flywheel or pulley to the shaft so rotational force is transferred without the component slipping.
⚠️ Common Signs of Failure
- Driven component rotates independently of the shaft
- Key is sheared or distorted
- Keyway is damaged
- Water pump stops turning despite shaft rotation
- Timing or flywheel alignment changes unexpectedly
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 90280-04M04 current OEM woodruff-key reference
OEM / Related Numbers
- 90280-04M04
- 90280-04M04-00
- 4mm Yamaha woodruff key
- Water-pump / flywheel / timing key where specified
Aftermarket / Verified Equivalents
- Sail Marine: 90280-04M04 replacement key
- Aftermarket Yamaha 4mm woodruff key
📦 Condition
- Genuine Yamaha part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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