Crankcase Check Valve - Mariner / Yamaha 4-300 HP (1987, 1989-1990, 1992, 2002, 2005-2006, 2008-2010, 2012, 2015) OEM# 21-80727M | WSM 601-300

Crankcase Check Valve Mariner / Yamaha 4 - 300 Hp OEM# 21-80727M

This WSM crankcase check valve is a quality aftermarket replacement part designed for Mariner 1 Cyl 2 Stroke 5 and 20 other compatible models.

It replaces selected OEM reference numbers including 21-80727M, 650-11370-00-00, 650-11370-01-00 and is suitable for service, repair and rebuild work.

Key Features

• Quality aftermarket replacement part from WSM
• Engineered for dependable fit, function and service life
• Designed for marine and powersports repair and maintenance
• Compatible with 25 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 601-300
• Product: Crankcase Check Valve
• OEM Reference: 21-80727M, 650-11370-00-00, 650-11370-01-00
• Application: Mariner 1 Cyl 2 Stroke 5 and 20 other compatible models

Product Fitment

This part is suitable for the following models:

• Mariner 1 Cyl 2 Stroke 5 – All Years
• Yamaha 2 Cyl 2.205 Bore 15 – 2001-2002
• Yamaha 2 Cyl 2.205 Bore 9.9 – 1984-1992
• Yamaha 2 Cyl 2.835 Bore 25 – 1984-1992
• Yamaha 2 Cyl 2.835 Bore 30 – 1984-1987
• Yamaha 2 Cyl 3.228 Bore 55 – 1985-1990
• Yamaha 3 Cyl 2.373 Bore 25 – 1989-1992
• Yamaha 3 Cyl 2.373 Bore 30 – 2001-2002
• Yamaha 3 Cyl 2.638 Bore 40 – 1987-1992
• Yamaha Yamaha – 2001-2002
• Yamaha 3 Cyl 2.834 Bore 60 – 2001-2006
• Yamaha 3 Cyl 2.834 Bore 70 – 2001-2009
• Yamaha 3 Cyl 3.228 Bore 85 – 2001-2005
• Yamaha 3 Cyl 3.228 Bore 90 – 1986-1989
• Yamaha 6 Cyl 3.544 Bore 2.6L HPDI 150 – 2001-2009
• Yamaha 6 Cyl 3.544 Bore 2.6L HPDI 175 – 1989
• Yamaha 6 Cyl 3.544 Bore 2.6L HPDI 200 – 1984-1989
• Yamaha 6 Cyl 3.660 Bore 3.3L HPDI 200 – 2001-2009
• Yamaha 6 Cyl 3.660 Bore 3.3L HPDI 225 – 2001-2015
• 6 Cyl 3.660 Bore 3.3L HPDI 250 – 2001-2012
• 6 Cyl 3.660 Bore 3.3L HPDI 300 – 2003-2010
• 2001-2012
• 2003-2009
• 2003-2008
• 2004-2010

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.

You May Also Need

Browse related parts for compatible models:

• Drain Plug Gasket Mercury / Mariner / Yamaha 2 - 350 / 500 - 700 - Pack of 50 OEM# 27-81987 – 555-10
• O-Ring Crankshaft Yamaha 9.9 - 225 Hp 94-21 OEM# 93210-32738-00 – 527-85
• Fuel Filter Mariner / Yamaha 9.9 - 225 Hp OEM# 18-7781 – 600-279
• Fuel Filter / Oil Mercury / Mariner / Yamaha 6 - 15 Hp OEM# 35-80365M – 600-274

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