• 90280-04M05 Yamaha Woodruff Key | Genuine OEM Yamaha Outboard Part
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90280-04M05 Yamaha Woodruff Key | Genuine OEM Yamaha Outboard Part

90280-04M05 Yamaha Woodruff Key | Genuine OEM Yamaha Outboard Part

$20.22 AUD
$20.22 AUD
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🔧 Product Description

Genuine Yamaha High-Horsepower Water Pump Woodruff Key - Part Number: 90280-04M05

A genuine Yamaha woodruff key used to drive the water-pump impeller on selected V4 and high-horsepower outboard lower units.

The key fits into the driveshaft keyway and engages the impeller hub, ensuring the impeller rotates at driveshaft speed.

⚙️ Key Features

  • Genuine Yamaha OEM water-pump drive key
  • Correct Yamaha part number 90280-04M05
  • Precision-machined semicircular profile
  • Included in Yamaha 6N6-series water-pump kits
  • Sierra replacement key available

🚤 Compatibility

Commonly used on

  • Yamaha V4 and high-horsepower lower-unit water pumps
  • Impeller installations using the 6E5-series pump components

Typically suits

  • Engine models:
  • Yamaha 100A two-stroke
  • Yamaha 115B and 115C two-stroke
  • Yamaha 130B two-stroke
  • Yamaha 140B two-stroke
  • Yamaha 115HP V4 production from approximately 1984 onward where specified
  • Yamaha F115A early four-stroke
  • Water-pump kit 6N6-W0078-02
  • High-horsepower lower units using impeller 6E5-44352-01
  • HP Range: Approximately 100HP - 140HP, with additional 6E5 pump-family applications
  • Engine Type: Yamaha V4 two-stroke and early F115 four-stroke outboard
  • Year Range: Lower-unit and pump-design controlled.

🔌 Function

The key mechanically couples the impeller to the driveshaft so the pump turns whenever the engine driveshaft rotates.

⚠️ Common Signs of Failure

  • Impeller does not rotate
  • Engine overheats immediately after pump service
  • Key is missing during assembly
  • Key is sheared or rolled over
  • Impeller hub or driveshaft keyway is damaged

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 90280-04M05 current OEM water-pump woodruff-key reference

OEM / Related Numbers

  • 90280-04M05
  • 90280-04M05-00
  • 6N6-W0078-02 related pump kit
  • 6E5-44352-01 related impeller

Aftermarket / Verified Equivalents

  • Sierra: 18-3302
  • Aftermarket Yamaha impeller drive key: 90280-04M05

📦 Condition

  • Genuine Yamaha part
  • Brand new
  • Supplied in original or equivalent packaging

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

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?

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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