Arco 5381X Replacement Starter – Mercury/Mariner 150–225 HP Outboard
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
ARCO 5381X Replacement Starter Motor
Keep your Mercury or Mariner outboard turning over reliably with this direct-fit replacement starter from ARCO Marine. Designed specifically for high-horsepower outboard applications, the 5381X delivers consistent cranking performance whether you’re launching in cold morning air or restarting mid-day on the water. A straightforward swap that restores starting confidence without the guesswork of sourcing an OEM unit.
Compatible Applications
- Mercury / Mariner 150–225 HP outboard engines
- 9-tooth drive gear configuration — confirm tooth count before ordering
Replaces OEM Part Numbers
- Mercury 50-856996T
- Mercury 50-86976
- Mercury 50-898265013
- Sierra 18-5609
- Sierra 18-6825
Drive Gear: 9-tooth
Parts Desk Insights
The 5381X is the correct starter for Mercury and Mariner outboards in the 150–225 HP range using a 9-tooth drive gear — confirm your tooth count before ordering, as the similar ARCO 57-5381 Starter (Mercury/Mariner 200–225 HP V6 DFI) covers a narrower DFI-specific application. This is a popular replacement on high-use sport fishing and charter boats where starters take a beating from frequent daily starts. When replacing the starter, it’s also worth inspecting the solenoid — the ARCO Mercury Starter Solenoid (57-SW275) and the ARCO 12V Starter Solenoid (SW109) are compatible options for this engine family. For Mercury 80–115 HP 4-stroke and Optimax applications, see the ARCO 5415 Starter.
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.