Starter Motor Assembly – Fits Yamaha 25-40HP Outboards (Replaces 65W-81800-03-00)
Starter Motor Assembly – Fits Yamaha 25-40HP Outboards (Replaces 65W-81800-03-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This is a direct aftermarket Starter Motor Assembly – Fits Yamaha 25-40HP Outboards (Replaces 65W-81800-03-00). It is designed for a precise fit on Yamaha 4-stroke 25–40HP outboard motors from 1998–2008, including F25, F30, and F40 models equipped with the Denso starter system. It is also a compatible replacement for select Mercury and Mariner 25HP 4-stroke models from 1998–2005.
It serves as a direct interchange for Yamaha part numbers 65W-81800-00-00 through 65W-81800-03-00, 67C-81800-00-00 through 67C-81800-02, and aftermarket references from Sierra (18-6437), ARCO (5364), and others.
- Installs as a direct bolt-on replacement for the original unit.
- Engineered for marine environments with a 12-volt, counter-clockwise rotation design.
- The Permanent Magnet Direct Drive (PMDD) assembly includes a 9-tooth pinion/spline.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 65W-81800-00-00 |
| Yamaha | 65W-81800-01-00 |
| Yamaha | 65W-81800-02-00 |
| Yamaha | 65W-81800-03-00 |
| Yamaha | 67C-81800-00 |
| Yamaha | 67C-81800-01 |
| Yamaha | 67C-81800-02 |
| United Technologies | 6767540-M030SM |
| United Technologies | 6767540MO30SM |
| Sierra | 18-6437 |
| ARCO | 5364 |
| API MARINE | MOT3014 |
| Mercury | 50-830308-1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This starter motor fits a wide range of Yamaha 4-stroke outboards from 25HP to 40HP manufactured between 1998 and 2008.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F25ELH | 25 | 4-Stroke | 1998–2008 | 65W-81800-03-00 | |
| Yamaha | F25ELR | 25 | 4-Stroke | 1998–2008 | 65W-81800-03-00 | |
| Yamaha | F25ESH | 25 | 4-Stroke | 1998–2008 | 65W-81800-03-00 | |
| Yamaha | F25ESR | 25 | 4-Stroke | 2001–2008 | 65W-81800-03-00 | |
| Yamaha | F25MLH | 25 | 4-Stroke | 1999–2008 | 65W-81800-03-00 | |
| Yamaha | F25MSH | 25 | 4-Stroke | 1999–2008 | 65W-81800-03-00 | |
| Yamaha | F25TLR | 25 | 4-Stroke | 1998–2008 | 65W-81800-03-00 | |
| Yamaha | F30TLR | 30 | 4-Stroke | 2001–2008 | 65W-81800-03-00 | |
| Yamaha | T25TLR | 25 | 4-Stroke | 2001–2008 | 65W-81800-03-00 | Denso System |
| Yamaha | F40EJR | 40 | 4-Stroke | 2003–2005 | 65W-81800-03-00 | |
| Yamaha | F40ESR | 40 | 4-Stroke | 2000–2005 | 65W-81800-03-00 | |
| Yamaha | F40MJH | 40 | 4-Stroke | 2001–2005 | 65W-81800-03-00 | |
| Yamaha | F40MLH | 40 | 4-Stroke | 2001–2005 | 65W-81800-03-00 | |
| Yamaha | F40MSH | 40 | 4-Stroke | 2001–2008 | 65W-81800-03-00 | |
| Yamaha | F40TLR | 40 | 4-Stroke | 2000–2005 | 65W-81800-03-00 | |
| Yamaha | F40BEJR | 40 | 4-Stroke | 2008 | 65W-81800-03-00 | B-series |
| Yamaha | F40BMJH | 40 | 4-Stroke | 2008 | 65W-81800-03-00 | B-series |
| Yamaha | F40BMLH | 40 | 4-Stroke | 2008 | 65W-81800-03-00 | B-series |
| Yamaha | F40BTLR | 40 | 4-Stroke | 2008 | 65W-81800-03-00 | B-series |
Also compatible with certain Mercury and Mariner 25HP 4-stroke outboards that use Yamaha-built powerheads.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 25E B/F | 25 | 4-Stroke | 1998–2005 | 50-830308-1 | Various design variants |
| Mercury | 25EH B/F | 25 | 4-Stroke | 1998–2005 | 50-830308-1 | Various design variants |
| Mercury | 25EL B/F | 25 | 4-Stroke | 1998–2005 | 50-830308-1 | Various design variants |
| Mercury | 25ELH B/F | 25 | 4-Stroke | 1998–2005 | 50-830308-1 | Various design variants |
| Mercury | 25ELPT B/F | 25 | 4-Stroke | 1998–2005 | 50-830308-1 | Various design variants |
| Mariner | 25E B/F | 25 | 4-Stroke | 1998–2001 | 50-830308-1 | Various design variants |
| Mariner | 25EH B/F | 25 | 4-Stroke | 1998–2001 | 50-830308-1 | Various design variants |
| Mariner | 25EL B/F | 25 | 4-Stroke | 1998–2001 | 50-830308-1 | Various design variants |
| Mariner | 25ELH B/F | 25 | 4-Stroke | 1998–2001 | 50-830308-1 | Various design variants |
| Mariner | 25ELPT B/F | 25 | 4-Stroke | 1998–2001 | 50-830308-1 | Various design variants |
Technical Specs
- Product Type
- Permanent Magnet Direct Drive (PMDD) Starter Motor Assembly
- Installation
- Direct bolt-on replacement
- Voltage
- 12 Volts DC
- Rotation
- Counter-Clockwise (CCW)
- Teeth/Splines
- 9 Teeth
- Starter Type
- PMDD
- Mounting Hole 1
- 9.0mm ID Unthreaded
- Mounting Hole 2
- 8.0mm ID Unthreaded
- Mounting Hole 3
- 8.0mm Slot ID Unthreaded
- Field Case Length
- 87.1mm (3.43 in)
- Pinion/Splines OD
- 28.9mm (1.138 in)
- Product Height
- 29.5
- Product Width
- 16.5
- Product Length
- 13.5
- Weight
- 2.48 kg (5.45 lbs)
- Warranty
- 1 Year (aftermarket); varies by manufacturer
What’s in the Box
- 1 x Starting Motor Assembly (65W-81800-03-00)
Installation Notes
- Always disconnect the battery before beginning work. Safety first.
- Locate and access the existing starter motor on the engine block.
- Carefully disconnect the main power cable and any other electrical connections from the starter terminals.
- Remove the mounting bolts that secure the old starter motor to the engine.
- Gently remove the old starter assembly. Be mindful of any shims or gaskets.
- Visually compare the new starter with the old one, paying close attention to mounting points, pinion gear, and electrical connections to ensure a perfect match.
- Position the new starter motor and loosely thread in the mounting bolts.
- Tighten the mounting bolts evenly to the manufacturer's recommended torque specification.
- Clean the electrical terminal contact points and securely reattach the power cables.
- Reconnect the boat's battery.
- Test the new installation by starting the engine. Check for any unusual noises or hesitation.
Troubleshooting & FAQ
How do I confirm this starter fits my specific engine model?
The best way is to compare your original part number to the list in our "Part Number Matrix." Also, check your engine's model, horsepower, and year against our "Engine & Model Compatibility" tables. Finally, visually compare your old part to our product photos.
What are the most common signs of a failing starter motor?
Common symptoms include a clicking sound when you turn the key, the engine turning over very slowly, a grinding noise during startup, or the starter not engaging at all (silence). Smoke or a burning smell from the starter area also indicates a serious failure.
Is this a direct bolt-on replacement?
Yes, this unit is engineered as a direct bolt-on replacement for the OEM part numbers listed. It uses the same mounting points and electrical connections, requiring no modifications for installation on a compatible engine.
My original starter used a retaining ring, but this one has a nut. Does that matter?
Some original Yamaha models used different pinion retention designs (retaining ring vs. nut). This aftermarket unit is designed to be compatible, but it's always critical to verify your original component style and ensure the new part will function correctly in your specific setup before installation.
What are the key differences between this aftermarket starter and the genuine OEM part?
Our aftermarket starter is designed to meet or exceed OEM specifications for fit, form, and function but at a more competitive price. While the OEM part carries the original brand name, ours provides comparable performance and reliability, backed by a 1-year warranty.
What is a PMDD starter?
PMDD stands for "Permanent Magnet Direct Drive." In this design, powerful permanent magnets are used instead of traditional field coils to create the magnetic field. This results in a lighter, more compact, and often more efficient starter motor compared to older designs.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available.
Warranty & returns
This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused parts in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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