Gasket Kit Powerhead - Mercury / Mariner 135 / 150 HP 6 Cyl 2L (1978-1990) OEM# 27-90484A88 | WSM 500-212

Gasket Kit Powerhead Mercury / Mariner 135 / 150 Hp 6 Cyl 2L 78-90 OEM# 27-90484A88

This WSM gasket kit powerhead is a quality aftermarket replacement part designed for Mercury 6 Cyl 3.125 Bore 2L 135 and 1 other compatible model.

It replaces selected OEM reference numbers including 27-90484A88 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 18 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 500-212
• Product: Gasket Kit Powerhead
• OEM Reference: 27-90484A88
• Application: Mercury 6 Cyl 3.125 Bore 2L 135 and 1 other compatible model

Product Fitment

This part is suitable for the following models:

• Mercury 6 Cyl 3.125 Bore 2L 135 – 1986
• Mercury 6 Cyl 3.125 Bore 2L 135 – 1987
• Mercury 6 Cyl 3.125 Bore 2L 135 – 1988
• Mercury 6 Cyl 3.125 Bore 2L 135 – 1989
• Mercury 6 Cyl 3.125 Bore 2L 135 – 1990
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1978
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1979
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1980
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1981
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1982
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1983
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1984
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1985
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1986
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1987
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1988
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1989
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1990

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.

About the Mercury 135-200 HP Outboard Engines

Mercury and Mariner 135-200 HP outboard engines are widely used across recreational and performance boating applications. These engines have long-standing aftermarket support, making quality replacement gaskets, ignition, fuel and powerhead parts important for service and rebuild work.

You May Also Need

Browse related parts for compatible models:

• Bearing Needles Mercury / Mariner 105 - 240 Hp Big Pin OEM# 29-822553 – 010-137-34
• Water Pump Service Kit Mercury / Mariner / Mercruiser 65 - 300 Hp OEM# 12290 – 725-157
• Thermostat Mercury 7.5 - 250 Hp 72-06 OEM# 62981 – 775-25
• Thermostat Kit Mercury 2.0 - 3.0 Liter V6 OEM# 75692Q2 – 775-25-2K

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