Piston Kit - Mercury / Mariner 135-200 HP Bottom Guided Starboard .015 Over (1981, 1988, 1991) OEM# 765-7042A2 | WSM 100-50-045SK

Piston Kit Mercury / Mariner 135 - 200 Hp Bottom Guided Starboard .015 Over OEM# 765-7042A2

This WSM piston kit is a quality aftermarket replacement part designed for Mariner 6 Cyl 3.125 Bore 2L 135 and 4 other compatible models.

It replaces selected OEM reference numbers including 765-7042A2, 765-7443A12, 765-7443A2 and is suitable for service, repair and rebuild work.

Key Features

• Quality replacement component for engine rebuild and repair
• Manufactured for dependable fitment and consistent performance
• Suitable for professional workshop or enthusiast use
• Compatible with 5 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 100-50-045SK
• Product: Piston Kit
• OEM Reference: 765-7042A2, 765-7443A12, 765-7443A2
• Application: Mariner 6 Cyl 3.125 Bore 2L 135 and 4 other compatible models

Product Fitment

This part is suitable for the following models:

• Mariner 6 Cyl 3.125 Bore 2L 135 – All Years
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1986-1991
• Mercury 6 Cyl 3.125 Bore 2L 175 – 1978-1991
• Mercury 6 Cyl 3.125 Bore 2L XR2 150 – 1976-1981
• Mercury – 1986-1988

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:

• Gasket Head Cover Mercury / Mariner 135 - 200 Hp 6 Cyl 78-88 OEM# 27-96278 – 505-37
• Propeller Shaft Mercury / Mariner 105 - 225 Hp OEM# 44-94148 – 449-122
• Gasket Head Mercury / Mariner 135 / 150 Hp V6 2L 78-90 OEM# 27-96281T01 – 505-36
• O-Ring Oil Pump Mercury / Mariner 105 - 300 Hp OEM# 25-11379 – 526-21

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