50-8M0033984 Aftermarket Mercruiser 10-Tooth CCW Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercury/Mariner 6-25HP two-stroke outboard starter motor - Part Number: 50-8M0033984

A 12-volt, ten-tooth starter for selected USA-built Mercury and Mariner two-stroke outboards. It replaces the 50-90983A1/50-90983T1 and 50-893889T starter families and is used from 6HP through 25HP where the serialised parts catalogue specifies this compact starter.

This is an outboard starter rather than a MerCruiser inboard unit. Japanese-built 0N-prefix engines and later four-stroke/EFI platforms use different starters.

⚙️ Key Features

• 12V marine outboard starter

• Ten-tooth pinion

• Compact starter for selected USA-built small two-strokes

• Complete motor and starter-drive assembly

• Current replacement for the 90983 starter family

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 50-8M0033984 → Supersedes 50-90983T1

• 50-90983T1 → Supersedes 50-90983A1

• 50-90983A1 → Replaces 50-893889T where specified

OEM / Related Numbers:

• Mercury: 50-8M0033984

• Mercury: 50-90983A1

• Mercury: 50-90983T1

• Mercury: 50-893889T

Aftermarket / Verified Equivalents:

• Sierra: 18-5611

• Recmar: REC50-8M0033984

🚤 Compatibility

Commonly used on:

• USA-built Mercury and Mariner carburetted two-stroke outboards

Typically suits:

• Engine models:

• Mercury 6HP from serial A197112 and later where electric start is fitted

• Mercury/Mariner 8HP

• Mercury/Mariner 9.9HP

• Mercury/Mariner 15HP

• Mercury 18HP from serial 5837437 and later

• Mercury/Mariner 20HP from serial 6443973 and later

• Mercury/Mariner 25HP from serial 5705532 and later

• HP Range: 6HP-25HP

• Engine Type: Two-cylinder carburetted two-stroke outboard

• Year Range: Approximately late 1970s-2000s, model dependent

• Fitment Note: Confirm USA-built engine family and 90983/8M0033984 starter number

🔌 Function

The starter rotates the flywheel and crankshaft until the two-stroke engine begins running.

Common signs of failure:

• No crank with correct battery voltage

• Slow cranking or excessive cable heating

• Pinion fails to engage the flywheel

• Starter drive slips or chatters

• Intermittent operation from worn brushes

📦 Condition

• Brand-new aftermarket outboard starter motor

• Supplied as a complete ten-tooth assembly

• Confirm engine origin, serial number and original starter before fitting