ARCO 57-5374 Outboard Starter – Mercury 65–85 HP 4-Cylinder
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
ARCO 57-5374 Replacement Outboard Starter Motor
Bring reliable starts back to your Mercury 4-cylinder outboard with the ARCO 57-5374 — a direct-fit replacement starter built for Mercury 65–85 HP inline 4-cylinder 2-stroke motors. Featuring a 10-tooth drive gear and OEM-matched specifications, this starter installs without modification and delivers the consistent cranking power your engine needs trip after trip.
Compatible Applications
- Mercury 65–85 HP 4-Cylinder 2-Stroke outboards (approximately 1972–1989)
Replaces OEM & Cross-Reference Part Numbers
- Mercury / Mariner: 50-79472, 50-79472A1
- Sierra: 18-5610
Specifications
- Drive gear: 10-tooth
Parts Desk Insights
This starter is the correct fit for older Mercury inline 4-cylinder 2-stroke motors in the 65–85 HP range — a common replacement on well-used motors that crank slowly or fail to engage. The 10-tooth drive gear is a key identifier; confirm your existing starter’s tooth count before ordering. For newer Mercury 4-cylinder applications, see the ARCO 5392 for Mercury/Mariner 80–125 HP Inline 4-Cylinder or the ARCO 5415 for Mercury 80–115 HP 4-Stroke. When replacing the starter, it’s also a good time to check the solenoid — see the ARCO Starter Solenoid for Mercury & MerCruiser (SW109).
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.