Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter motor for Mercury Mariner outboard 40-50HP, 2-stroke, black marine part from 4Boats
Starter motor for Mercury Mariner outboard 40-50HP, marine engine part from 4Boats UK
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter motor for Mercury Mariner outboard 40-50HP, 2-stroke, black marine part from 4Boats
Starter motor for Mercury Mariner outboard 40-50HP, marine engine part from 4Boats UK
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1
Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1

Starter Motor for Mercury Mariner 40 50 60 HP 2-Stroke 50-73521 50-44369A1

5399N

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£140.00 £124.99 Save £15.01
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Starter Motor 50-73521

For Mercury & Mariner 40-60 HP 2-Stroke Outboards

This premium quality replacement starter motor is engineered to provide reliable cranking power for Mercury and Mariner 2-stroke outboard engines. Designed for the harsh marine environment, it serves as a direct-fit replacement for the 3-cylinder 40HP, 50HP, and 60HP models typically manufactured between 1974 and 1994.

RELIABILITY: Precision-balanced and 100% load tested to meet or exceed original equipment (OE) standards for cold-cranking performance.

Key Features

  • ✔ Direct fit for 3-cylinder models
  • ✔ High-torque permanent magnet design
  • ✔ Sealed housings to prevent corrosion
  • ✔ 10-Tooth pinion for smooth engagement

Technical Specs

Voltage: 12V
Rotation: CCW (Counter-Clockwise)
Teeth: 10 Teeth
Type: PMDD
Field Housing: ~4.1 in. / 104.5mm

Compatibility / Fitment Guide

Engine Make Horsepower / Model Typical Years
Mercury / Mariner 40 HP (3-Cylinder) 1974 - 1994
Mercury / Mariner 50 HP (3-Cylinder) 1974 - 1994
Mercury / Mariner 60 HP (3-Cylinder) 1984 - 1994
Mercury / Mariner 70 HP (3-Cylinder) 1974 - 1985

OEM Cross Reference

Mercury Marine 50-73521, 50-73521T, 50-44369, 50-44369A1, 50-898265005
Sierra Marine 18-5605, 18-5606
Arco Marine 5379, 5388, 3424
United Technologies 4820240, 4820340, SM47764, SM48203, 996240

Questions & Answers

Is this a genuine original part?

This is a premium quality aftermarket replacement part, manufactured by specialists to meet or exceed original equipment (OE) standards for durability and performance.

How do I know if it is compatible?

Please check the cross-reference list above. If your original starter has part number 50-73521 or 50-44369 stamped on the housing, this unit is a guaranteed fit.

How many teeth are on the drive gear?

This starter features a 10-tooth pinion gear, specifically designed to mesh perfectly with the flywheel on compatible Mercury and Mariner 40-60HP outboards.

Note: At 4boats.co.uk, we recommend verifying your original part number against the references above before purchasing to ensure 100% fitment.

For the products under £150 the shipping is £6.99.

Free delivery for most items over £150.

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