• Head Plug Gasket Mercury / Mariner / Yamaha 25 - 300 Hp 84-21 OEM# 27-81990M,
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WSM

Head Plug Gasket - Mercury / Mariner / Yamaha 25-300 HP (1985-1986, 1989, 1992, 1999-2000, 2003-2006, 2008-2010, 2012, 2015, 2021) OEM# 27-81990M | WSM 555-78

Head Plug Gasket - Mercury / Mariner / Yamaha 25-300 HP (1985-1986, 1989, 1992, 1999-2000, 2003-2006, 2008-2010, 2012, 2015, 2021) OEM# 27-81990M | WSM 555-78

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Head Plug Gasket Mercury / Mariner / Yamaha 25 - 300 Hp 84-21 OEM# 27-81990M

This WSM head plug gasket is a quality aftermarket replacement part designed for Mariner 4 Cyl 4 Stroke 100 and 55 other compatible models.

It replaces selected OEM reference numbers including 27-81990M, 90430-14115-00 and is suitable for service, repair and rebuild work.

Key Features

  • Quality replacement gasket designed for dependable sealing performance
  • Ideal for service, repair and engine rebuild work
  • Manufactured for fit, durability and reliable installation
  • Compatible with 65 listed fitments
  • Replaces selected OEM reference numbers listed below

Product Details

  • Brand: WSM
  • WSM Part Number: 555-78
  • Product: Head Plug Gasket
  • OEM Reference: 27-81990M, 90430-14115-00
  • Application: Mariner 4 Cyl 4 Stroke 100 and 55 other compatible models

Product Fitment

This part is suitable for the following models:

  • Mariner 4 Cyl 4 Stroke 100 – All Years
  • Mercury 4 Cyl 4 Stroke 115 – 2006-2008
  • Mercury 4 Cyl 4 Stroke 75 – 2001-2008
  • Mercury 4 Cyl 4 Stroke 80 – 2000-2005
  • Mercury 4 Cyl 4 Stroke 90 – 2006-2008
  • Mercury 4 Cyl 4 Stroke EFI 75 – 2000-2005
  • Mercury 4 Cyl 4 Stroke EFI 90 – 2006-2008
  • Mercury 6 Cyl 4 Stroke 225 – 2006-2008
  • Mercury 2 Cyl 4 Stroke 25 – 2003-2006
  • Yamaha Yamaha – 2001-2021
  • Yamaha 3 Cyl 2.638 Bore 50 – 1984-1992
  • Yamaha 3 Cyl 2.834 Bore 60 – 2001-2004
  • Yamaha 3 Cyl 2.834 Bore 70 – 1984-1992
  • Yamaha 3 Cyl 3.228 Bore 90 – 2001-2008
  • Yamaha 3 Cyl 4 Stroke 30 – 2001-2004
  • Yamaha 3 Cyl 4 Stroke 40 – 1989
  • Yamaha 3 Cyl Jet 40 – 2001-2008
  • Yamaha 3 Cyl Jet 4 Stroke 40 – 1984-1989
  • Yamaha 4 Cyl 3.544 Bore 115 – 2001-2009
  • Yamaha 4 Cyl 3.544 Bore 130 – 2001-2021
  • Yamaha 4 Cyl 4 Stroke 100 – 2001-2021
  • Yamaha 4 Cyl 4 Stroke 115 – 1991-1992
  • Yamaha 4 Cyl 4 Stroke 150 – 2002-2021
  • Yamaha 4 Cyl 4 Stroke 50 – 1984-1989
  • Yamaha 4 Cyl 4 Stroke 60 – 1996-2010
  • Yamaha 4 Cyl 4 Stroke 70 – 1988-1989
  • Yamaha 4 Cyl 4 Stroke 75 – 1996-2004
  • Yamaha 4 Cyl 4 Stroke 80 – 2001-2003
  • Yamaha 4 Cyl 4 Stroke 90 – 2001-2021
  • Yamaha 4 Cyl 4 Stroke 1.8L SHO 115 – 2004-2021
  • Yamaha 4 Cyl 4 Stroke 2.8L 175 – 2001-2021
  • Yamaha 4 Cyl Jet 4 Stroke 115 – 2002-2021
  • Yamaha 4 Cyl Jet 4 Stroke 150 – 2010-2021
  • Yamaha 4 Cyl Jet 4 Stroke 60 – 2003-2021
  • Yamaha 4 Cyl Jet 4 Stroke 90 – 2001-2003
  • Yamaha 6 Cyl 220 – 2003-2021
  • Yamaha 6 Cyl 3.544 Bore 150 – 2015-2021
  • Yamaha 6 Cyl 3.544 Bore 175 – 2001-2003
  • Yamaha 6 Cyl 3.544 Bore 200 – 2003-2021
  • Yamaha 6 Cyl 3.544 Bore 2.6L HPDI 150 – 2016-2021
  • Yamaha 6 Cyl 3.544 Bore 2.6L HPDI 175 – 2004-2021
  • Yamaha 6 Cyl 3.544 Bore 76 Degree 200 – 2003-2021
  • Yamaha 6 Cyl 3.544 Bore 76 Degree 225 – 1984-1986
  • Yamaha 6 Cyl 3.544 Bore 76 Degree 250 – 1984-1989
  • Yamaha 6 Cyl 3.544 Bore 90 Degree 200 – 1997-2010
  • 6 Cyl 3.660 Bore 3.3L HPDI 225 6 Cyl 3.660 Bore 3.3L HPDI 200 – 1984-1989
  • Yamaha 6 Cyl 3.660 Bore 3.3L HPDI 225 – 1998-2000
  • Yamaha 6 Cyl 3.660 Bore 3.3L HPDI 250 – 1984-1985
  • Yamaha 6 Cyl 3.660 Bore 3.3L HPDI 300 – 2001-2015
  • Yamaha 6 Cyl 4 Stroke 3.3L 200 – 2001-2012
  • Yamaha 6 Cyl 4 Stroke 3.3L 225 – 2001-2010
  • Yamaha 6 Cyl 4 Stroke 3.3L 250 – 1997-1999
  • Yamaha 6 Cyl 4 Stroke 4.2L SHO 200 – 2001-2005
  • Yamaha 6 Cyl 4 Stroke 4.2L SHO 225 – 1997-1999
  • Yamaha 6 Cyl 4 Stroke 4.2L SHO 250 – 2001-2005
  • 6 Cyl 4 Stroke 4.2L SHO 300 – 1997-1999
  • 2001-2004
  • 1986-1989
  • 2001-2012
  • 2003-2009
  • 2004-2010
  • 2002-2021
  • 2005-2021
  • 2010-2021
  • 2013

Why Buy WSM

WSM is a trusted manufacturer of aftermarket marine and powersports parts, known for dependable quality, strong fitment coverage and workshop-ready replacement components.

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Please use the fitment guide, OEM references and images to confirm this is the correct part before ordering.

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