Starter Motor – Fits Yamaha 40HP 2-Stroke Enduro/CV Outboards (Replaces 66T-81800-00, 66T-81800-01, 66T-81800-04)
Starter Motor – Fits Yamaha 40HP 2-Stroke Enduro/CV Outboards (Replaces 66T-81800-00, 66T-81800-01, 66T-81800-04) 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 aftermarket Starter Motor – Fits Yamaha 40HP 2-Stroke Enduro/CV Outboards (Replaces 66T-81800-00, 66T-81800-01, 66T-81800-04) is designed for reliable performance in Yamaha 40HP 2-Stroke Enduro/CV series engines (models 40XWP, 40XWT, E40X, and more) manufactured between 1998 and 2018. It operates on a 12V system and features a 9-tooth counter-clockwise (CCW) drive gear for consistent starts.
It serves as a direct interchange for Yamaha OEM part numbers 66T-81800-00, 66T-81800-01, 66T-81800-02, 66T-81800-03, and 66T-81800-04, ensuring broad compatibility and a straightforward replacement process.
- Direct bolt-on installation with no modifications required.
- Engineered for marine environments with a durable metal housing.
- Includes a 6-month aftermarket warranty against manufacturing defects.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 66T-81800-00 | Original superseded part |
| Yamaha | 66T-81800-01 | Supersedes 66T-81800-00 |
| Yamaha | 66T-81800-02 | Alternative replacement |
| Yamaha | 66T-81800-03 | Alternative replacement |
| Yamaha | 66T-81800-04 | Current recommended replacement |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This starter is specifically designed for select 40HP 2-Stroke Yamaha outboard models, primarily within the Enduro and CV series.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40XWP | 40 | 2-Stroke | 1998–2018 | 66T-81800-00/01/04 | Enduro/CV series |
| Yamaha | 40XWT | 40 | 2-Stroke | 1998–2018 | 66T-81800-00/01/04 | Enduro/CV series |
| Yamaha | E40X | 40 | 2-Stroke | 1998–2002 | 66T-81800-00/01/04 | Enduro series |
| Yamaha | E40XMH | 40 | 2-Stroke | 1998–2002 | 66T-81800-00/01/04 | Enduro series |
| Yamaha | 40XWH | 40 | 2-Stroke | 1998–2018 | 66T-81800-00/01/04 | Enduro/CV series |
Technical Specs
- Product Type
- Electric Starter Motor
- Installation
- Direct Replacement
- Voltage
- 12V
- Teeth
- 9
- Rotation
- Counter-Clockwise (CCW)
- Housing Material
- Metal
- Wattage
- 2 KW
- Dimensions
- 23.0 cm x 13.0 cm x 13.0 cm
- Warranty
- 6 Months (Aftermarket)
- Other Technical Attributes
- Direct bolt-on replacement for OEM units
What’s in the Box
- 1 x Starter Motor Assembly
Installation Notes
- Disconnect the battery terminals to prevent electrical shorts.
- Locate the old starter motor and disconnect the main positive cable and ignition switch wire.
- Remove the mounting bolts securing the starter to the engine block. Note their length and position.
- Carefully extract the old starter motor. Clean the mounting surface on the engine.
- Position the new starter motor, ensuring the drive gear aligns correctly with the flywheel.
- Secure the new starter with the original mounting bolts, tightening them to the manufacturer's torque specifications.
- Reconnect the electrical wires and ensure all connections are clean and tight.
- Reconnect the battery terminals and test the new starter motor by starting the engine.
Troubleshooting & FAQ
How do I confirm this starter fits my exact Yamaha model?
The best method is to match your engine's model, year, and original part number to the information in our compatibility tables. Cross-reference the OEM part number (e.g., 66T-81800-04) stamped on your old starter with the numbers listed in our Part Number Matrix.
What are the common signs of a failing starter motor?
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. These can indicate worn internal components or electrical issues within the starter.
Is this starter a direct bolt-on replacement for the original?
Yes, this unit is designed to be a direct replacement. It uses the same mounting points and electrical connections as the factory Yamaha starters it replaces, requiring no modifications for installation.
Why is the rotation direction (CCW) important?
The rotation direction—in this case, Counter-Clockwise (CCW)—is critical for the starter gear to properly engage with the engine's flywheel. Using a starter with the wrong rotation will prevent the engine from cranking.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 6-month warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in 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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