Thrust Washer – Fits Yamaha 2-Stroke Outboards & KT100 Engines (Replaces 90209-20159-00)
Thrust Washer – Fits Yamaha 2-Stroke Outboards & KT100 Engines (Replaces 90209-20159-00) 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
Thrust Washer – Fits Yamaha 2-Stroke Outboards & KT100 Engines ...
Product Details
This high-grade Thrust Washer – Fits Yamaha 2-Stroke Outboards & KT100 Engines is engineered for select Yamaha 2-Stroke outboards from 4–15 HP (1974–2007) and specific KT100 racing kart engines, providing a reliable fit for crankshaft and connecting rod assemblies.
It serves as a direct replacement for OEM part numbers 90209-20159-00, 90209-20M23, and 90209-20159.
- Installs on the crankshaft/connecting rod assembly.
- Designed as a bottom rod thrust washer for KT100 applications.
- Crafted from durable steel for long-lasting performance under stress.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 90209-20159-00 | Primary replacement |
| Yamaha | 90209-20M23 | Interchangeable part number |
| Yamaha | 90209-20159 | Interchangeable part number |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
This part is known to fit a wide range of Yamaha small engines, including select outboards, PW/BW/YZ series dirt bikes, Snosport snowmobiles, and classic motorcycles.
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | PW80 | 2-Stroke | 1983, 1991–2005 | 90209-20159-00 | |
| Yamaha | BW80 | 2-Stroke | 1986–1990 | 90209-20159-00 | |
| Yamaha | YZ80 | 2-Stroke | 1993–2001 | 90209-20159-00 | |
| Yamaha | YZ85 | 2-Stroke | 2002–2023 | 90209-20159-00 | |
| Yamaha | SV125 Snosport | 2-Stroke | 1990–1991 | 90209-20159-00 | |
| Yamaha | SV125E Snosport | 2-Stroke | 1990–1991 | 90209-20159-00 | Electric start model |
| Yamaha | RD200 | 2-Stroke | 1974–1976 | 90209-20159-00 | |
| Yamaha | CS3 | 2-Stroke | 1971 | 90209-20159-00 | |
| Yamaha | YCS1 | 2-Stroke | 1968 | 90209-20159-00 |
Fitment for Yamaha KT100 racing engines.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Yamaha | KT100 | 2-Stroke | 90209-20159 | Bottom rod thrust washer, #7 on diagram |
Fitment for Yamaha marine outboard applications.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | 5CS | 8 HP | 2-Stroke | 90209-20159 | |
| Yamaha | 9.9F/FM/FEM/MHV | 9.9 HP | 2-Stroke | 90209-20159-00 | Also FMH/MSH models |
| Yamaha | 13.5AMH | 13.5 HP | 2-Stroke | 90209-20159-00 | |
| Yamaha | 15F/FEM/FM/MH/MSH | 15 HP | 2-Stroke | 90209-20159-00 | Also FW/MHH models |
Technical Specs
- Product Type
- Thrust Washer / Special Shaped Washer
- Installation Location
- Crankshaft/connecting rod assembly
- Material
- Steel
- Product Dimensions
- 11.0" L x 9.0" W x 0.3" H
- Fitting Type
- Connecting rod thrust washer
- Other Attributes
- Bottom rod thrust washer (for KT100 applications)
What’s in the Box
- 1 x Washer, Spec'l Shap (Replaces 90209-20159-00)
Installation Notes
- Always consult your engine’s official service manual before beginning work.
- Disconnect the engine's power source and drain any relevant fluids (e.g., oil, coolant).
- Carefully disassemble engine components to gain access to the crankshaft and connecting rod.
- Note the orientation of the old thrust washer before removing it.
- Clean the mating surfaces thoroughly to remove any old oil or debris.
- Install the new thrust washer, ensuring it is seated correctly as per the manual's diagram.
- Reassemble all components, torquing bolts and fasteners to the manufacturer's specified values.
- Refill fluids, reconnect power, and check for proper operation before returning to regular service.
Troubleshooting & FAQ
How do I know if this thrust washer fits my specific engine model?
This part fits a wide range of Yamaha engines. The best way to confirm a match is to cross-reference your original part number with those listed in our Part Number Matrix. Also, check the compatibility tables to see if your model and year are listed.
What are the signs of a failing thrust washer?
Symptoms of a worn or failed thrust washer can include excessive crankshaft end play (back-and-forth movement), a knocking or ticking sound from the engine's bottom end, and in severe cases, catastrophic engine failure.
Can I use this for both my Yamaha outboard and my KT100 kart engine?
Yes, this part is specified for use in certain Yamaha marine outboards as well as the popular KT100 racing kart engine, where it functions as a bottom rod thrust washer. Verify the part number for your specific application.
What is the primary function of this thrust washer?
A thrust washer is designed to manage axial (or "thrust") loads along a rotating shaft. In this context, it prevents the connecting rod from moving side-to-side on the crankshaft journal, ensuring smooth and stable engine operation.
Is this a genuine Yamaha OEM part?
This listing is for an aftermarket replacement, not an OEM component. It has been engineered to meet or exceed OEM-level specifications with comparable high-quality materials. Our parts are manufactured in an ISO 9002 facility and batch-inspected for quality and consistency.
How much is shipping and how fast will it arrive?
We ship worldwide quickly, with a typical transit time of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options will appear at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not order.
- This is an aftermarket replacement part, not an OEM component. All mentions of brand names and part numbers are for reference purposes only.
- Professional installation is highly recommended to ensure safety and optimal performance. Incorrect installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine and powersport parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without ever compromising on materials or quality control.
Payment & Security
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