STARTER MOTOR FOR MERCURY MARINER OUTBOARD 40-50 HP, 50-73521, 2 STROKE - 4Boats
STARTER MOTOR FOR MERCURY MARINER OUTBOARD 40-50 HP, 50-73521, 2 STROKE - 4Boats
STARTER MOTOR FOR MERCURY MARINER OUTBOARD 40-50 HP, 50-73521, 2 STROKE - 4Boats
STARTER MOTOR FOR MERCURY MARINER OUTBOARD 40-50 HP, 50-73521, 2 STROKE - 4Boats

STARTER MOTOR Mercury/Mariner 40-50 HP Starter 50-73521 | 4Boats

5399N

  • Dispatched in 2-3 days
  • 30 Day Return Policy
  • In stock, ready to ship
  • Backordered, shipping soon
Our stock levels are dynamic and can change frequently. If a product appears to be in stock, it may have already sold out. Please contact us if you have any questions about availability. Thank you for your understanding.
£140.00 £98.99 Save £41.01
/
Tax included.

100% new STARTER MOTOR for Mercury and Mariner 2‑stroke outboards - a high‑torque, marine‑grade 12V PMDD starter that replaces 50‑73521/5399 for dependable starts.

  • 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 for secure, corrosion‑resistant hook‑up
  • Marine‑grade internals: High‑conductivity materials and corrosion‑resistant coatings; moisture‑sealed
  • Durability & cold starts: High cranking power for reliable starts in all conditions
  • Condition: 100% brand new - not rebuilt or refurbished
  • Replaces: Mercury 50‑73521, LESTER 5399, United Technologies 1097028 (1097028‑M030SM), SM10790, SM10970, Sierra 18‑5605, Arco 5379, API MOT3007N, Arrowhead SAB0016, J & N 410‑21047, WAI 5399N and related part numbers
  • Compatibility: Mercury 2‑stroke outboards 29.8-37.3 kW (40-50 HP), 1976-1997 - including Jet and Magnum series (Jet 30, 40ELPTO, 40ELHPTO, 40ELO, 40EO, 45ELO, etc.) - direct OEM fit; Mariner 2‑stroke outboards 29.8-37.3 kW (40-50 HP), 1980-1997 - including Magnum & Jet models (40ELPTO, 40ELHPTO, 40ELO, etc.)

Order this direct‑fit, high‑performance starter for extended life, easy installation and dependable marine starts.

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

Free delivery for the most items over £150.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

You may also like

Recently viewed

Why choose us

Untitled_1080_x_1080_px_1 - 4Boats

ITS ALL ABOUT THE QUALITY

We source the best products from the Top suppliers only. We’ve taken years of feedback and have doubled down on providing the best service.

Untitled_1080_x_1080_px_2 - 4Boats

TEAMWORK MAKES THE DREAMWORK

Our Suppliers and Partners are joining us in our commitment to challenge the way this industry operates. From product sourcing to fulfilling, they’re the best in the business.

Simple_Image_Play_Built_into_Routine_Cosmetics_TikTok_In-Feed_Ad_1080_x_1080_px_10 - 4Boats

YOU MATTER TO US.

All your orders are personally checked by a member of 4 BOATS and we make sure your orders are dispatched quickly so it arrives to your doorstep ASAP