Piston (Standard) – Fits Yamaha 200-300HP Outboard Engines (Replaces 6D0-11631-01-85)
Piston (Standard) – Fits Yamaha 200-300HP Outboard Engines (Replaces 6D0-11631-01-85) 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 is a standard size Piston (Standard) – Fits Yamaha 200-300HP Outboard Engines (Replaces 6D0-11631-01-85) designed for Yamaha 2-Stroke 200HP, 225HP, 250HP, and 300HP outboard engines from years 2004-2005 and newer.
This part serves as a direct replacement for Yamaha OEM part numbers 6D0-11631-01-85 and its superseded equivalent, 6D0-11631-02-84.
- Installation: Direct replacement fit.
- Fuel Type: Compatible with 2-Stroke gasoline engines.
- Size: This is a standard size piston, not an oversized model.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6D0-11631-01-85 | 6D0-11631-02-84 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha engines, please verify the model, horsepower, and year range against the compatible models listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Z300TXRC HPDI | 300 | 2-Stroke | 2004 | 6D0-11631-01-85 | Superseded by 6D0-11631-02-84 |
| Yamaha | 200-300HP | 200-300 | 2-Stroke | 2004–2005 | 6D0-11631-01-85 | Superseded by 6D0-11631-02-84 |
Technical Specs
- Product Type
- Piston (Standard)
- Installation
- Direct replacement
- Fuel Type
- Gasoline (2-Stroke)
- Housing Material
- Aluminum Alloy
- Dimensions
- 10.0" L x 9.5" W x 10.0" H
- Other Technical Attributes
- Standard size (not oversized)
What’s in the Box
- 1 x Piston (Standard) (Replaces 6D0-11631-01-85/6D0-11631-02-84)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the power source.
- Remove the engine cowling and cylinder head cover to access the cylinders.
- Carefully extract the old piston, taking note of the orientation of all connecting parts.
- Clean the cylinder bore and connecting rod surfaces to remove any carbon buildup or debris.
- Generously lubricate the new piston and cylinder wall using 2-stroke engine oil.
- Install the new piston, making sure the piston rings are correctly spaced and seated.
- Reassemble all components in reverse order, tightening all bolts to the manufacturer's specified torque.
- Once fully assembled, reconnect the power and test the engine's operation in a safe manner.
Troubleshooting & FAQ
Is this piston standard size or oversized?
This is a standard size piston. It is not an oversized or repair model and should be used in cylinders that are within original factory specifications.
Which Yamaha part numbers does this V-STROM replace?
It is a direct replacement for Yamaha part number 6D0-11631-01-85, which has been officially superseded by part number 6D0-11631-02-84.
What engine models does this piston fit?
This piston is designed for a range of Yamaha 2-Stroke V6 outboard engines from 200HP to 300HP, including the Z300TXRC HPDI (2004) and other models from 2004-2005 onwards. Always consult your engine's service manual to confirm part number compatibility before purchasing.
Do I need other parts for a full installation?
This listing includes the piston only. For a complete rebuild, you will likely need to purchase piston rings, a wrist pin, and retaining clips separately.
What are the signs of a failing piston?
Common symptoms of piston failure include a noticeable loss of compression, a persistent knocking or rattling sound from the engine, an increase in exhaust smoke, and a general decrease in engine power and performance.
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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