STARTER MOTOR FOR MERCURY MARINER OUTBOARD 40-50 HP, 50-73521, 2 STROKE

Starter Motor for Mercury & Mariner 40–50HP 2-Stroke Outboards (1976–1997) – Replaces 50-73521 / LESTER 5399

Upgrade or replace your starter with this 100% new, high-performance starter motor engineered for Mercury and Mariner 2-stroke outboards (30JET to 50HP, 1976–1997). Designed to exceed OEM standards, this marine-grade unit delivers maximum cranking power, durability, and corrosion resistance, ensuring dependable starts in the harshest environments.

✅ Key Features:

• Voltage: 12V

• Rotation: CCW (Counterclockwise)

• Teeth: 10-Tooth Pinion

• Design: PMDD (Permanent Magnet Direct Drive)

• Construction: Precision-machined components with upgraded steel shafts

• Connection: 2-wire with ring terminals

• Marine-Grade: High-conductivity internals with corrosion-resistant coatings

• Durability: Engineered for high cycle endurance and harsh marine conditions

• Condition: 100% brand new – not rebuilt or refurbished

🔁 Replaces Part Numbers:

• Mercury: 50-73521, 50-73521T, 8184453, 50-898265005

• Sierra Marine: 18-5605

• Arco: 5379

• API Marine: MOT3007N

• Arrowhead: SAB0016

• J & N: 410-21047

• WAI: 5399N

• LESTER: 5399

• United Technologies: 1097028, SM10790, SM10970

⚓ Engine Compatibility:

Mariner 2-Stroke Outboards:

• 40HP–50HP (1980–1997) including Magnum & Jet models

  • 40ELHPTO, 40ELO, 40ELPTO, 40EO Jet 30, 45ELHO, 50E, 50EL, 50ELPT, etc.

Mercury 2-Stroke Outboards:

• 40HP–50HP (1976–1997) including Jet & Magnum series

  • 40ELPTO, 40EO Jet 30, 45ELO, 50ELH, 50HP, 50EH, and more

🔧 Please check your engine model and part number before ordering. If unsure, message us with your engine serial number and we’ll confirm compatibility.

🛠️ Why Choose This Starter?

• Reliable Cold Starts: Strong cranking power under all conditions

• Built for Marine Use: Moisture-sealed and corrosion-resistant materials

• Exact Fit: Direct replacement for OEM units—no modifications needed

• Extended Lifespan: Precision-engineered for endurance and long service life