# 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

## Details

- **Price:** 517.65 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 517.65 AUD | In stock |

## Images

- 508M0080274 Mercury MerCruiser Starter | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/508m0080274-mercury-mercruiser-starter-genuine-quicksilver-oem-part)
> Updated: 2026-05-17