Arco 5392 Replacement Starter – Mercury/Mariner 80–125 HP Inline 4-Cylinder Outboards
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You have 30 days to request a return. All sale items are final sale.
Arco 5392 Replacement Outboard Starter Motor
The Arco 5392 is a direct-fit replacement starter for Mercury and Mariner inline 4-cylinder outboards in the 80 to 125 HP range. These are among the most widely used outboard engines in the recreational boating market, found on everything from family runabouts to fishing boats, and the 5392 restores reliable starting performance with an 8-tooth drive gear and straightforward OEM-style installation. If your Mercury or Mariner inline 4 is cranking slowly or the starter has failed, this is the correct replacement unit.
Compatible Applications
- Mercury/Mariner 80 HP inline 4-cylinder outboards
- Mercury/Mariner 100 HP inline 4-cylinder outboards
- Mercury/Mariner 125 HP inline 4-cylinder outboards
- 8-tooth drive gear configuration required
Replaces OEM Part Numbers
- Mercury: 50-66015-1, 50-66015-T, 50-66015-3
Key Features
- Direct OEM replacement fit — no modifications required
- 8-tooth drive gear for correct flywheel engagement
- Built for inline 4-cylinder Mercury and Mariner powerheads
- Corrosion-resistant construction for saltwater and freshwater use
- SKU: 57-5392
Parts Desk Insights
The 5392 covers the inline 4-cylinder Mercury and Mariner outboards in the 80–125 HP class — a very common engine family that powered a huge number of recreational boats through the 1980s and 1990s. The 8-tooth drive gear is the critical spec to confirm before ordering; other Mercury starters in similar HP ranges use 9 or 10-tooth drives and will not fit. For Mercury 2-stroke applications in the 75–115 HP range, also see the Arco 5377 and the Arco 5380. For Mercury 4-stroke applications, the Arco 5415 covers 80–115 HP 4-stroke and Optimax Jet. When replacing the starter, inspect the solenoid at the same time — the Arco SW275 Mercury Solenoid (12V Isolated Base) is the recommended companion for this application.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.