Washer – Fits Yamaha 225–250 HP 2-Stroke Outboard Engines (Replaces 90201-31M00)
Washer – Fits Yamaha 225–250 HP 2-Stroke Outboard Engines (Replaces 90201-31M00) 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
Washer – Fits Yamaha 225–250 HP 2-Stroke Outboard Engines (Replaces...
Product Details
This is a factory-spec stainless steel Washer – Fits Yamaha 225–250 HP 2-Stroke Outboard Engines (Replaces 90201-31M00) for Yamaha outboard gearcase assemblies. It's primarily used in Yamaha 225FET, 250AET, 250BET, and L250AET 2-stroke V6 outboard engines.
This component provides a direct interchange for Yamaha 90201-31M00 and Mercruiser 8043052.
- Constructed from high-grade stainless steel for corrosion resistance.
- Designed for internal lower unit installation on the prop shaft assembly.
- Engineered to match OEM specifications for fit and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 90201-31M00 |
| Mercruiser | 8043052 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha outboards, this washer is specific to the 2-stroke V6 models listed. Please verify your engine code matches.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Yamaha | 225FET | 225 | 2-Stroke | 90201-31M00 |
| Yamaha | 250AET | 250 | 2-Stroke | 90201-31M00 |
| Yamaha | 250BET | 250 | 2-Stroke | 90201-31M00 |
| Yamaha | L250AET | 250 | 2-Stroke | 90201-31M00 |
Technical Specs
- Product Type
- Stainless Steel Washer
- Installation
- Internal Lower Unit Component
- Housing Material
- Stainless Steel
- Dimensions
- Height: 0.3; Width: 10.5; Length: 13.0;
- Other Technical Attributes
- For Prop Shaft Assembly
What’s in the Box
- 1 x Washer (90201-31M00)
Installation Notes
- Ensure the engine is off, disconnected from the battery, and trimmed to a vertical position.
- Place a drain pan under the lower unit and remove the gearcase oil drain and vent plugs to empty the oil.
- Remove the propeller and all associated hardware (nut, cotter pin, spacers).
- Unbolt and carefully separate the lower unit from the upper engine housing.
- Disassemble the gearcase as required to access the propeller shaft assembly. Refer to your service manual for detailed diagrams.
- Identify and remove the worn or damaged washer from the prop shaft.
- Clean the shaft and surrounding components of any old grease, oil, or debris.
- Install the new washer in the correct position and orientation.
- Reassemble the propeller shaft assembly and gearcase, ensuring all seals and gaskets are correctly seated.
- Re-install the lower unit, torquing bolts to the manufacturer's specified values.
- Refill the gearcase with the recommended marine gear lubricant.
- Re-install the propeller and secure it with its hardware. Always use a new cotter pin.
Troubleshooting & FAQ
How do I know if this washer fits my specific engine?
This washer is designed for a narrow range of Yamaha 2-stroke V6 models: 225FET, 250AET, 250BET, and L250AET. The most reliable way to confirm fitment is by matching the OEM part number 90201-31M00 to the one listed in your engine's service manual.
Where is this washer located in the engine?
This washer is an internal component found within the lower unit (gearcase). It is part of the propeller shaft assembly, which requires disassembly of the gearcase to access.
What are the signs of a failing prop shaft washer?
Symptoms of a worn or failed washer can include excessive propeller vibration, unusual rattling or grinding noises from the gearcase (especially in gear), or the presence of fine metal shavings in the gear oil during a lubricant change.
Is this washer made from the same material as the original?
Yes, this part is manufactured from stainless steel to meet or exceed OEM specifications. This ensures high strength and excellent corrosion resistance in marine environments, just like the factory original.
Is any special tool required for installation?
Installation requires standard mechanic's tools for lower unit service, which may include a socket set, torque wrench, bearing pullers, and seal drivers. Accessing the prop shaft assembly requires disassembling the gearcase, which is a moderately complex task.
What is the difference between an OEM part and an aftermarket part?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to the same specifications and with comparable high-quality materials as the OEM version. Our parts are produced in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How fast is shipping and what does it cost?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be displayed at checkout.
What kind of warranty and return policy do you offer?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order number. Returns are accepted within our standard return window for items that are unused and in their original packaging. Please see our full policy page or contact us 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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