508M0080274 Mercury MerCruiser Starter | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Starter Motor - Part Number: 50-8M0080274

Genuine Quicksilver/Mercury starter motor for selected Mercury 4-stroke outboard applications. This OEM starter is used on compatible 135HP and 150HP Mercury FourStroke engines and provides reliable cranking performance for the engine starting system.

⚙️ Key Features

• Genuine Quicksilver/Mercury OEM starter motor

• Designed for selected Mercury 135HP and 150HP 4-stroke outboards

• Direct replacement starter for compatible Mercury outboard starting systems

• Helps restore reliable engine cranking and start-up performance

• Cross-referenced with multiple later Mercury starter service numbers

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 50-8M0187292 → Supersedes 50-8M0142679

• 50-8M0142679 → Supersedes 50-8M0137789

• 50-8M0137789 → Supersedes 50-8M0096343

• 50-8M0096343 → Supersedes 50-8M0080274

• 50-8M0080274 → Supersedes 50-8M0061073

• 50-8M0061073 earlier OEM reference

OEM / Related Numbers:

• 50-8M0080274

• 8M0080274

• 508M0080274

• 50-8M0061073

• 8M0061073

• 50-8M0096343

• 8M0096343

• 50-8M0137789

• 8M0137789

• 50-8M0142679

• 8M0142679

• 50-8M0187292

• 8M0187292

Aftermarket / Verified Equivalents:

• Sierra: 18-55505

🚤 Compatibility

Commonly used on:

• Mercury 135HP / 150HP FourStroke outboard starting systems

• Mercury outboard starter applications using the 8M0061073 / 8M0080274 starter family

Typically suits:

• Engine models:

• Mercury 135HP 4-Stroke outboard, 2011 and newer application range where 50-8M0080274 starter is specified

• Mercury 150HP 4-Stroke outboard, 2011 and newer application range where 50-8M0080274 starter is specified

• Mercury 135HP EFI FourStroke outboards using the 8M0061073 / 8M0080274 starter family

• Mercury 150HP EFI FourStroke outboards using the 8M0061073 / 8M0080274 starter family

• Mercury service applications now cross-referenced through 50-8M0096343, 50-8M0137789, 50-8M0142679 and 50-8M0187292

• HP Range: 135HP - 150HP

• Engine Type: Mercury 4-stroke outboard electric starting system

• Year Range: Approximately 2011 onwards, depending on model and serial number

🔌 Function

The starter motor engages the engine flywheel and cranks the outboard during start-up. A correctly functioning starter is essential for reliable starting, especially under load or after long storage.

Common signs of failure:

• Starter clicks but does not crank

• Slow cranking with a charged battery

• Intermittent starting

• Grinding or abnormal starter noise

• Starter motor spinning without engaging

• Burnt smell or overheating from starter body

• Corrosion or water damage around starter terminals

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging