Washer, Plate – Fits Yamaha Outboard Engines 4-300HP (Replaces 90201-10M01-00)
Washer, Plate – Fits Yamaha Outboard Engines 4-300HP (Replaces 90201-10M01-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Washer, Plate – Fits Yamaha Outboard Engines 4-300HP (Replaces 9020...
Product Details
This replacement Washer, Plate – Fits Yamaha Outboard Engines 4-300HP (Replaces 90201-10M01-00) is designed for a broad range of Yamaha 2-stroke and 4-stroke outboard engines, primarily from the 1990s through the 2000s. It ensures the propeller is correctly spaced and secured on the propeller shaft for optimal performance and safety.
This component is a direct replacement for Yamaha part numbers 90201-10M01-00 and the superseded 90201-10M14-00.
- Installation: The washer plate is installed on the propeller shaft, positioned between the propeller and the shaft housing.
- Material: Constructed from durable steel to withstand the harsh marine environment and mechanical stress.
- Complete Assembly: Designed to be used with a 10mm castle nut (90171-10M01-00) and secured with a cotter pin (91490-30020-00/91490-30030-00).
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 90201-10M14-00 | 90201-10M01-00 |
| Yamaha | 90201-10M01-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha models, verify that your engine falls within the specified horsepower and stroke type. Comparing the OEM part number is the most reliable method to ensure a match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9MSHS | 9.9 | 2-Stroke | 1994 | 90201-10M01-00 | Used with castle nut 90171-10M01-00 |
| Yamaha | F20SMHA | 20 | 4-Stroke | 2012–2018 | 90201-10M01-00 |
Technical Specs
- Product Type
- Propeller Washer Plate
- Installation
- Placed between propeller and propeller shaft
- Material
- Steel
- Product Dimensions
- 12.0" L x 10.0" W x 0.4" H
- Box Dimensions
- 12.0" L x 10.0" W x 0.4" H
- Thread Size
- Compatible with 10mm castle nut (90171-10M01-00)
- Other Technical Attributes
- Used with cotter pin (91490-30020-00/91490-30030-00) for securing propeller
What’s in the Box
- 1 x Washer, Plate (90201-10M01-00)
Installation Notes
- Ensure the engine is completely turned off, and the gear is set to neutral. For added safety, disconnect the battery.
- Remove the cotter pin from the castle nut on the propeller shaft.
- Unscrew the castle nut, and remove the outer washer.
- Carefully slide the propeller off the shaft, followed by the old washer plate.
- Inspect the propeller shaft splines and seals for any damage or debris. Clean as necessary.
- Slide the new washer plate onto the propeller shaft against the gearcase.
- Reinstall the propeller, outer washer, and castle nut.
- Tighten the castle nut to the manufacturer's specified torque. Do not overtighten.
- Align the castle nut slots with the hole in the propeller shaft and insert a new cotter pin, bending the ends to secure it.
Troubleshooting & FAQ
How do I know if this washer plate fits my engine?
This part fits a wide range of Yamaha 4-300HP outboards. The most reliable way to confirm fitment is to match your engine's original part number to 90201-10M01-00 or its superseded part number, 90201-10M14-00. Also, check the compatibility table provided for specific models.
What other parts are needed for a full propeller installation?
This washer plate is one component of the propeller assembly. For a complete installation, you will also need a compatible propeller, an outer washer, a 10mm castle nut (like Yamaha p/n 90171-10M01-00), and a new cotter pin (such as 91490-30020-00 or 91490-30030-00).
What are signs that my current washer plate needs replacing?
Signs of a failing washer plate include visible corrosion, cracks, or significant wear. Functionally, a worn washer can cause excessive propeller vibration, rattling noises from the lower unit, or a feeling of looseness in the propeller assembly.
Can I reuse my old castle nut and cotter pin?
While the castle nut can sometimes be reused if it is in excellent condition, it is always recommended to use a new cotter pin for every installation to ensure the propeller is securely fastened and prevent catastrophic failure.
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.
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