Yamaha - Woodruff Key - Engine Timing Component - 90280-04M05-00

Overview

A woodruff key is one of those parts that seems minor right up until it fails. I’ve seen flywheels and timing-related components slip just enough to cause hard starting, rough running, or bigger internal headaches. The Yamaha Woodruff Key 90280-04M05-00 is there to keep critical rotating parts locked in position so everything stays indexed the way Yamaha intended. It’s a small, inexpensive part, but it protects a whole lot of expensive ones around it.

Key Features

• Maintains Component Alignment – Keeps rotating engine parts properly indexed on the shaft.

• Supports Accurate Timing – Helps prevent slippage that can affect ignition or mechanical timing.

• Yamaha Precision Fit – Manufactured to Yamaha tolerances for proper seating and engagement.

• High-Strength Metal Construction – Built to handle torque loads and resist deformation.

• Ideal Service Replacement – Smart to replace during flywheel, crankshaft, or related service work.

Engine & Boat Compatibility

90280-04M05-00 fits a wide range of Yamaha outboards. Always verify fitment by model and serial before ordering.

• 115 – 1984–2005
• 130 – 1988–2004
• 150 – 1984–2005
• 175 – 1984–2000
• 200 – 1984–2005
• 225 – 1990–2005
• 250 – 1990–2005
• F115 – 2000–Current
• LF115 – 2000–Current
• VF115 – 2015
• F150 – 2004–Current
• LF150 – 2004–Current
• VF150 – 2014–Current
• F175 – 2014–Current
• VF175 – 2015–Current
• F200 – 2002–Current
• LF200 – 2002–Current
• F225 – 2002–Current
• LF225 – 2002–2010
• F250 – 2002–Current
• LF250 – 2002–Current
• VZ150 – 2000–2013
• VZ175 – 2001–2013
• VZ200 – 2001–2009
• VZ225 – 2003–2009
• VZ250 – 2003–2009
• VZ300 – 2004–2009
• Z150 – 2000–2005
• Z175 – 2001–2005
• Z200 – 2000–2013
• Z250 – 2003–2005
• Z300 – 2004–2006
• LZ150 – 2000–2005
• LZ200 – 2000–2012
• LZ250 – 2003–2005
• LZ300 – 2004–2006
• VX150 – 2000–2004
• VX200 – 2000–2005
• VX225 – 2000–2004
• VX250 – 2002–2004
• SX150 – 1999–2004
• SX200 – 1999–2005
• SX225 – 2000–2003
• SX250 – 2000–2003
• DX150 – 1999–2005
• C115 – 1991–2000
• C150 – 1996–1999
• B115 – 1998–1999
• P115 – 1993–1996
• P150 – 1991–1999
• P175 – 1994–1999
• P200 – 1991–1999
• S115 – 1996–1999
• S130 – 1996–1999
• S150 – 1996–1999
• S175 – 1996–1999
• S200 – 1996–1999
• S225 – 1996–1999
• S250 – 1996–1999
• V150 – 2000–2005
• V175 – 2000
• V200 – 1998–1999
• V225 – 1998–1999
• Z series and counter-rotation variants – 2000–2006
• ProV150 – 1986–1990
• V6 Special – 1984–1986
• V6 Excel – 1987–1989

FAQ

Q: What does a woodruff key actually do?
A: It locks a rotating part like a flywheel or gear into the correct position on the shaft so it cannot slip.

Q: What are signs of a damaged woodruff key?
A: Hard starting, timing issues, slipping components, or visible shearing when disassembled.

Q: Should I replace the key when servicing the flywheel?
A: Yes, especially if there is any sign of wear, flattening, or distortion.

Q: Can a bad woodruff key cause major engine damage?
A: It can. If timing or component alignment shifts, it can lead to bigger internal problems fast.

Q: Is installation difficult?
A: Not usually, but it has to seat fully and cleanly or the part it supports may not align correctly.

• Engine Application
  • 115 – 1984–2005
  • 130 – 1988–2004
  • 150 – 1984–2005
  • 175 – 1984–2000
  • 200 – 1984–2005
  • 225 – 1990–2005
  • 250 – 1990–2005
  • F115 – 2000–Current
  • LF115 – 2000–Current
  • VF115 – 2015
  • F150 – 2004–Current
  • LF150 – 2004–Current
  • VF150 – 2014–Current
  • F175 – 2014–Current
  • VF175 – 2015–Current
  • F200 – 2002–Current
  • LF200 – 2002–Current
  • F225 – 2002–Current
  • LF225 – 2002–2010
  • F250 – 2002–Current
  • LF250 – 2002–Current
  • VZ150 – 2000–2013
  • VZ175 – 2001–2013
  • VZ200 – 2001–2009
  • VZ225 – 2003–2009
  • VZ250 – 2003–2009
  • VZ300 – 2004–2009
  • Z150 – 2000–2005
  • Z175 – 2001–2005
  • Z200 – 2000–2013
  • Z250 – 2003–2005
  • Z300 – 2004–2006
  • LZ150 – 2000–2005
  • LZ200 – 2000–2012
  • LZ250 – 2003–2005
  • LZ300 – 2004–2006
  • VX150 – 2000–2004
  • VX200 – 2000–2005
  • VX225 – 2000–2004
  • VX250 – 2002–2004
  • SX150 – 1999–2004
  • SX200 – 1999–2005
  • SX225 – 2000–2003
  • SX250 – 2000–2003
  • DX150 – 1999–2005
  • C115 – 1991–2000
  • C150 – 1996–1999
  • B115 – 1998–1999
  • P115 – 1993–1996
  • P150 – 1991–1999
  • P175 – 1994–1999
  • P200 – 1991–1999
  • S115 – 1996–1999
  • S130 – 1996–1999
  • S150 – 1996–1999
  • S175 – 1996–1999
  • S200 – 1996–1999
  • S225 – 1996–1999
  • S250 – 1996–1999
  • V150 – 2000–2005
  • V175 – 2000
  • V200 – 1998–1999
  • V225 – 1998–1999
  • Z series and counter-rotation variants – 2000–2006
  • ProV150 – 1986–1990
  • V6 Special – 1984–1986
  • V6 Excel – 1987–1989