Standard Piston Kit – Fits Yamaha 115-225 HP Outboard (Replaces 6R5-11631-11-93)
Standard Piston Kit – Fits Yamaha 115-225 HP Outboard (Replaces 6R5-11631-11-93) 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 Standard Piston Kit is designed for Yamaha 115-225 HP 2-Stroke outboard engines, specifically covering models from 1996–2005 such as the L150TXRQ, 200TLRQ, and 225TLRQ. It serves as a high-quality replacement for the starboard side piston, ensuring reliable engine performance.
It directly replaces OEM part numbers 6R5-11631-10-93 and 6R5-11631-11-93.
- Installs in the starboard side of the engine block.
- Engineered for Yamaha 2-stroke outboard gasoline engines.
- Kit includes piston, ring set, pin, and clips for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 6R5-11631-10-93 | 6R5-11631-11-93 | Original OEM Part |
| Yamaha | 6R5-11631-11-93 | Current OEM Part |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Outboards: This part fits specific 2-stroke models. Please verify your model and year range carefully, as this piston is for the starboard side only.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 150TLRQ | 150 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 150TXRQ | 150 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | L150TXRQ | 150 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 175TLRQ | 175 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 175TXRQ | 175 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 200TJRQ | 200 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 200TLRQ | 200 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 200TXRQ | 200 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | L200TXRQ | 200 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 225TLRQ | 225 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 225TXRQ | 225 | 2-Stroke | 1996–1999 | 6R5-11631-11-93 | Starboard piston |
| Yamaha | 150CETO (6R2) | 150 | 2-Stroke | 1992 | 6R5-11631-11-93 | International model |
| Yamaha | 175BETO (6R3) | 175 | 2-Stroke | 1992 | 6R5-11631-11-93 | International model |
| Yamaha | 200BETO (6R4) | 200 | 2-Stroke | 1992 | 6R5-11631-11-93 | International model |
| Yamaha | L200BETO (6R1) | 200 | 2-Stroke | 1992 | 6R5-11631-11-93 | International model |
| Yamaha | 225BETO (6R5) | 225 | 2-Stroke | 1992 | 6R5-11631-11-93 | International model |
Technical Specs
- Product Type
- Standard Piston Kit
- Installation
- Engine Block Starboard Side
- Fuel Type
- Gasoline
- Housing Material
- Aluminum
- Dimensions
- Height: 9.5"; Width: 10.0"; Length: 9.5"
- Diameter
- 90mm (Standard Size)
- Fitting Type
- Cylinder Bore
- Engine Compatibility
- For Yamaha 2-stroke outboard engines
What’s in the Box
- 1 x Piston (Replaces 6R5-11631-11-93)
- 1 x Ring Set
- 1 x Piston Pin (Replaces 6R5-11633-10-00)
- 2 x Piston Pin Clips
Installation Notes
- Disconnect the battery and fuel lines to ensure safety.
- Remove the cylinder head and any components blocking access to the piston.
- Carefully extract the old piston pin, piston, and rings from the connecting rod.
- Thoroughly clean the cylinder bore and inspect for any scoring or damage.
- Install the new rings onto the new piston according to provided instructions.
- Lubricate the piston, rings, and cylinder wall with 2-stroke engine oil.
- Use a ring compressor tool to gently guide the new piston assembly into the cylinder.
- Reinstall the piston pin and clips, then reassemble the engine in reverse order.
- Use a torque wrench to tighten all fasteners to the manufacturer's specified values.
Troubleshooting & FAQ
How do I know if this is the correct piston for my engine?
This is a standard size piston for the starboard side of specific Yamaha 2-stroke outboards (115-225 HP) made between 1996 and 1999 and certain 1992 international models. Always verify your OEM part number is 6R5-11631-11-93 and check the compatibility table. Note that the port side piston uses a different part number (6R5-11642-11-93).
What is the difference between a standard size and an oversized piston?
This is a standard (STD) 90mm diameter piston, intended for a cylinder bore that is within original factory specifications. Oversized pistons are used when the cylinder has been machined (bored out) to fix wear or damage, requiring a larger piston to maintain proper clearance.
What are common signs of a failing piston?
Key indicators include a noticeable loss of compression, increased exhaust smoke, a rhythmic knocking or "slapping" sound from the engine, and the presence of metal shavings in the engine oil. A compression test is a reliable method for diagnosing piston or ring failure.
Are special tools required for this installation?
Yes, professional installation is recommended. A piston ring compressor is essential to install the piston into the cylinder without damaging the rings. A torque wrench is also mandatory to ensure all bolts are tightened to the correct OEM specifications for safety 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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