Water Pump Service Kit - Yamaha 40 / 50 HP 3 Cylinder (1984-1991) OEM# 18-3429 | WSM 725-415

Water Pump Service Kit Yamaha 40 / 50 Hp 3 Cylinder 84-91 OEM# 18-3429

This WSM water pump service kit is a quality aftermarket replacement part designed for Yamaha 3 Cyl 2.638 Bore 40 and 3 other compatible models.

It replaces selected OEM reference numbers including 18-3429, 6H4-W0078-00-00, 6H4-W0078-01-00, 6H4-W0078-A0-00 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 18 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 725-415
• Product: Water Pump Service Kit
• OEM Reference: 18-3429, 6H4-W0078-00-00, 6H4-W0078-01-00, 6H4-W0078-A0-00
• Application: Yamaha 3 Cyl 2.638 Bore 40 and 3 other compatible models

Product Fitment

This part is suitable for the following models:

• Yamaha 3 Cyl 2.638 Bore 40 – 1984
• Yamaha 3 Cyl 2.638 Bore 40 – 1985
• Yamaha 3 Cyl 2.638 Bore 40 – 1986
• Yamaha 3 Cyl 2.638 Bore 40 – 1987
• Yamaha 3 Cyl 2.638 Bore 40 – 1988
• Yamaha 3 Cyl 2.638 Bore 40 – 1989
• Yamaha 3 Cyl 2.638 Bore 40 – 1990
• Yamaha 3 Cyl 2.638 Bore 40 – 1991
• Yamaha 3 Cyl 2.638 Bore 50 – 1984
• Yamaha 3 Cyl 2.638 Bore 50 – 1985
• Yamaha 3 Cyl 2.638 Bore 50 – 1986
• Yamaha 3 Cyl 2.638 Bore 50 – 1987
• Yamaha 3 Cyl 2.638 Bore 50 – 1988
• Yamaha 3 Cyl 2.638 Bore 50 – 1989
• Yamaha 3 Cyl 2.638 Bore 50 – 1990
• Yamaha 3 Cyl 2.638 Bore 50 – 1991
• Yamaha 3 Cyl Jet 40 – 1991
• Yamaha 3 Cyl Jet 50 – 1991

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:

• Water Pump Impeller Yamaha 25 - 60 Hp OEM# 18-3068 – 700-415
• Seal Water Pump Yamaha 40 - 60 Hp 4 Stroke OEM# 18-1828 – 770-123
• Switch Tilt & Trim Yamaha 15 - 115 Hp 2 / 4-Stroke 95-21 OEM# 63D-82563-10-00 – 905-110
• O-Ring Throttle Body Mercury / Mariner / Yamaha 25 - 115 Hp 95-09 OEM# 881513 – 527-71

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