Starter Motor – Fits Yamaha 75HP-90HP Outboard Engines (Replaces 688-81800-10/11/12)
Starter Motor – Fits Yamaha 75HP-90HP Outboard Engines (Replaces 688-81800-10/11/12) 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 75HP-90HP Outboard Engines, offering a reliable replacement for a wide range of models. It is engineered for Yamaha 2-Stroke (75HP, 80HP, 85HP, 90HP from 1984–2009), Yamaha 4-Stroke (F75, F80, F90, F100 from 1999–2004), and select Mercury/Mariner 4-Stroke outboards (75HP, 90HP from 2000–2005).
It serves as a direct interchange for Yamaha part numbers 688-81800-10-00, 688-81800-11-00, and 688-81800-12-00, as well as Mercury/Mariner 50804312T1, Sierra 18-6423, and API Marine MOT5015.
- Engineered for direct, bolt-on installation.
- Features a durable 9-tooth drive gear.
- Operates on a standard 12V DC system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 688-81800-10-00 |
| Yamaha | 688-81800-11-00 |
| Yamaha | 688-81800-12-00 |
| Mercury/Mariner | 50804312T1 |
| Sierra | 18-6423 |
| API Marine | MOT5015 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is known to fit a wide range of Yamaha 2-stroke and 4-stroke outboards. Verify your specific model and year against the list to ensure correct fitment.
This starter is also a compatible replacement for certain Mercury and Mariner 4-stroke models that use Yamaha-built powerheads.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 90TJRR | 90 | 2-Stroke | 1993 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLG-JD | 90 | 2-Stroke | 1988 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLG | 90 | 2-Stroke | 1988 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLD-JD | 90 | 2-Stroke | 1990 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLJ | 90 | 2-Stroke | 1986 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETXN | 90 | 2-Stroke | 1984 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLF | 90 | 2-Stroke | 1989 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLF-JD | 90 | 2-Stroke | 1989 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLD | 90 | 2-Stroke | 1990 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90TJRP | 90 | 2-Stroke | 1991 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90TLRR | 90 | 2-Stroke | 1993 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90TJRQ | 90 | 2-Stroke | 1992 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLN | 90 | 2-Stroke | 1984 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90TLRQ | 90 | 2-Stroke | 1992 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90TLRP | 90 | 2-Stroke | 1991 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLJ-JD | 90 | 2-Stroke | 1986 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLDA | 90 | 2-Stroke | 1990 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLK | 90 | 2-Stroke | 1985 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | C80TLRV | 80 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRT | 90 | 2-Stroke | 1995 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRS | 85 | 2-Stroke | 1994 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRB | 90 | 2-Stroke | 2003 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | B90TLRV | 90 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | P75TLHW | 75 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | CV85ELF | 85 | 2-Stroke | 1989 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRV | 90 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLR | 90 | 2-Stroke | 2005–2009 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C75TLRW | 75 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRT | 85 | 2-Stroke | 1995 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | P75TLHX | 75 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | B90TLRX | 90 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | CV85ELD | 85 | 2-Stroke | 1990 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C75TLRT | 75 | 2-Stroke | 1995 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C90TLRX | 90 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRS | 90 | 2-Stroke | 1994 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C90TLRW | 90 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRA | 90 | 2-Stroke | 2002 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRU | 90 | 2-Stroke | 1996 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRW | 90 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRU | 85 | 2-Stroke | 1996 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRZ | 90 | 2-Stroke | 2001 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C90TLRZ | 90 | 2-Stroke | 2001 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C75TLRX | 75 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | B90TLRW | 90 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C90TLRY | 90 | 2-Stroke | 2000 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRP | 85 | 2-Stroke | 1991 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRX | 90 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRR | 85 | 2-Stroke | 1993 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRY | 90 | 2-Stroke | 2000 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C85TLRQ | 85 | 2-Stroke | 1992 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | P75TLHV | 75 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRZ | 90 | 2-Stroke | 2001 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRD | 90 | 2-Stroke | 2005 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | CV85ETLD | 85 | 2-Stroke | 1990 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | P75TLHU | 75 | 2-Stroke | 1996 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C90TLRV | 90 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C75TLRS | 75 | 2-Stroke | 1994 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRY | 90 | 2-Stroke | 2000 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRV | 90 | 2-Stroke | 1997 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRT | 90 | 2-Stroke | 1995 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRU | 90 | 2-Stroke | 1996 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRW | 90 | 2-Stroke | 1998 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TJRX | 90 | 2-Stroke | 1999 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRS | 90 | 2-Stroke | 1994 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | C75TLRU | 75 | 2-Stroke | 1996 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90TLRC | 90 | 2-Stroke | 2004 | 688-81800-12-00 | STARTING MOTOR |
| Yamaha | 90ETLH-JD | 90 | 2-Stroke | 1987 | 688-81800-12-00 | ELECTRIC STARTER |
| Yamaha | 90ETLH | 90 | 2-Stroke | 1987 | 688-81800-12-00 | ELECTRIC STARTER |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F100TLRX | 100 | 4-Stroke | 1999 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TXRX | 100 | 4-Stroke | 1999 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TLRX | 80 | 4-Stroke | 1999 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TXRX | 80 | 4-Stroke | 1999 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TJRA | 80 | 4-Stroke | 2002 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F75TLRB | 75 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TXRB | 100 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TXRZ | 100 | 4-Stroke | 2001 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TLRA | 100 | 4-Stroke | 2002 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TLRA | 80 | 4-Stroke | 2002 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TLRB | 100 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TLRZ | 80 | 4-Stroke | 2001 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TJRB | 80 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F90TJRB | 90 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TLRZ | 100 | 4-Stroke | 2001 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F100TXRA | 100 | 4-Stroke | 2002 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F90TLRB | 90 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F75TLRC | 75 | 4-Stroke | 2004 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F80TLRB | 80 | 4-Stroke | 2003 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F90TLRC | 90 | 4-Stroke | 2004 | 67F-81800-00-00 | STARTING MOTOR |
| Yamaha | F90TJRC | 90 | 4-Stroke | 2004 | 67F-81800-00-00 | STARTING MOTOR |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 90EXLPT Saltwater | 90 | 4-Stroke | 2001–2005 | 50804312T1 | Compatible replacement |
| Mercury | 90ELPT Saltwater | 90 | 4-Stroke | 2004–2005 | 50804312T1 | Compatible replacement |
| Mercury | 90ELPT | 90 | 4-Stroke | 2000–2005 | 50804312T1 | Compatible replacement |
| Mercury | 90ELHPT | 90 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
| Mercury | 75ELPT | 75 | 4-Stroke | 2000–2005 | 50804312T1 | Compatible replacement |
| Mercury | 75ELHPT | 75 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
| Mariner | 90EXLPT Saltwater | 90 | 4-Stroke | 2001 | 50804312T1 | Compatible replacement |
| Mariner | 90ELPT Coastal | 90 | 4-Stroke | 2000 | 50804312T1 | Compatible replacement |
| Mariner | 90ELPT | 90 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
| Mariner | 90ELHPT | 90 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
| Mariner | 75ELPT | 75 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
| Mariner | 75ELHPT | 75 | 4-Stroke | 2000–2001 | 50804312T1 | Compatible replacement |
Technical Specs
- Product Type
- Electric Starter Motor
- Installation
- Direct OEM Replacement
- Connection
- 9-Tooth Drive Gear
- Voltage
- 12V DC Operation
- Housing Material
- Cast Metal
- Housing Color
- Black
- Fitting Type
- Direct Bolt-On
- Dimensions
- Height: 27.5cm; Width: 16.0cm; Length: 12.5cm
What’s in the Box
- 1 x Starter Motor Assembly
Installation Notes
- Disconnect the battery terminals to prevent electrical shorts.
- Locate the existing starter motor on the engine block.
- Note and disconnect the main power cable and ignition switch wire from the starter solenoid.
- Remove the mounting bolts securing the starter to the engine.
- Carefully extract the old starter motor.
- Clean the mounting surface on the engine block.
- Position the new starter motor and tighten the mounting bolts to the manufacturer's torque specifications.
- Reconnect the power cable and ignition wire to the correct terminals on the new solenoid.
- Reconnect the battery terminals, starting with the positive lead.
- Test the new starter by turning the ignition key. Listen for smooth engagement and cranking.
Troubleshooting & FAQ
How do I know if my starter motor has failed?
Common signs of a failing starter include a clicking sound when turning the key, slow or no cranking, or the starter motor spinning without engaging the engine's flywheel. Always check your battery and electrical connections first to rule out other issues.
Is this starter compatible with both 2-stroke and 4-stroke engines?
Yes, this particular starter motor is designed to fit specific Yamaha 2-stroke (1984–2009) and 4-stroke (1999–2004) models, as well as some Mercury/Mariner 4-stroke engines. Please check the detailed compatibility tables to confirm your exact model is listed.
What is the difference between Yamaha part numbers 688-81800-10, -11, and -12?
These part numbers represent superseded versions of the same starter motor. The -12 version is the latest and most current OEM part number, which this aftermarket replacement is designed to interchange with. They are functionally identical for the applications listed.
Does this starter require any special wiring or modification?
No, this is a direct-fit replacement. It is designed to use the factory mounting points and electrical connections without any need for modification. Simply unbolt the old starter and bolt this one in its place.
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 1-year 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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