✅ Compatibility

• OEM / Cross-Reference Part Numbers: 5073521, 50735211, 5073521T, 50898265005 (Mercury); 5379 (ARCO Marine); 5399 (Lester); RS41007 (Remy Small Motor); 185605 (Sierra Marine); 1097028, 1097028M030SM, 4820240, 4820240M030SM, 996240, SM10790, SM10970, SM48202 (United Technologies); 71095399, 91091013 (Wilson)
• Mariner Outboard (40HP): 40ELHPTO, 40ELHPTO Magnum, 40ELO, 40ELO Magnum, 40ELPTO, 40ELPTO Magnum, 40EO, 40EO Jet 30, 40EO Magnum — 1989–1997
• Mariner Outboard (45HP): 45ELHO, 45ELHPTO, 45ELO, 45ELPTO — 1986–1989
• Mariner Outboard (50HP): 50E, 50EL, 50ELH, 50ELO, 50ELPT, 50ELPTO — 1980–1986
• Mercury Outboard (40HP): 40ELHPTO, 40ELO, 40ELPTO, 40EO, 40EO Jet 30 — 1989–1997
• Mercury Outboard (45HP): 45ELHO, 45ELHPTO, 45ELO, 45ELPTO — 1986–1989
• Mercury Outboard (50HP): 50E, 50EH, 50EL, 50ELH, 50ELPT, 50HP — 1976–1985

🔑 Key Specs

• Voltage: 12V
• Teeth: 10T
• Compatible Brands: Mercury, Mariner
• Application: Outboard Marine Engine (40HP / 45HP / 50HP)
• Application Years: 1976–1997
• Condition: New Aftermarket
• Quantity: 1 Piece

📦 What's Included

• 1 × Starter Motor 5073521 / 5073521T (New Aftermarket)

🔧 Product Highlights

• Direct OEM replacement for Mercury and Mariner 40HP/45HP/50HP outboard engines; plug-and-play across 1976–1997 model years including Magnum and Jet variants.
• 18 cross-reference codes — Mercury OEM (5073521, 5073521T), ARCO Marine 5379, Sierra Marine 185605, Lester 5399, United Technologies SM10790/SM48202, and Wilson variants for easy sourcing.
• Restores reliable engine starting — eliminates no-crank or slow-crank conditions on Mercury/Mariner 40–50HP outboard applications; lower than OEM price.

All part numbers are provided for reference purposes only. Verify your existing starter motor part number before ordering. If you are unsure, feel free to ask us — we will be happy to confirm fitment for you.