Piston Kit (Standard) – Fits Yamaha 100-225HP Outboards (Replaces 6R5-11642-11-93)
Piston Kit (Standard) – Fits Yamaha 100-225HP Outboards (Replaces 6R5-11642-11-93) 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 is a standard size Piston Kit (Standard) – Fits Yamaha 100-225HP Outboards for the port side cylinder on various 2-stroke Yamaha V4 and V6 models manufactured from 1992 onwards. It is engineered for engines including the 115, 130, 140, 150, 175, 200, and 225 HP series, ensuring reliable performance and fitment.
This kit serves as a direct replacement for Yamaha OEM part numbers 6R5-11642-11-93, 6R5-11642-10-93, 6R5-11631-11-93, and 64D-11642-00-90.
- Designed specifically for port side cylinder installation.
- Offers direct OEM fitment for straightforward replacement.
- Includes the piston, rings, wrist pin, and clips for a complete assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6R5-11642-11-93 |
| Yamaha | 6R5-11642-10-93 |
| Yamaha | 6R5-11631-11-93 |
| Yamaha | 64D-11642-00-90 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 100A/AETO, 100TLR | 100 | 2-Stroke | 1993–Later | 6R5-11642-11-93 | Port side |
| Yamaha | 115AEL/B/BETO/BE-TR/C/CEO/CETO, C115TLR | 115 | 2-Stroke | 1993–Later | 6R5-11642-11-93 | Port side |
| Yamaha | 130B/BETO, 130TLR/TLRZ | 130 | 2-Stroke | 1993–2004 | 6R5-11642-11-93 | Port side |
| Yamaha | 140A, 140B | 140 | 2-Stroke | 1993–Later | 6R5-11642-11-93 | Port side |
| Yamaha | 150CETO, 150TLR/TXRQ, L150CETO, L150TXRQ | 150 | 2-Stroke | 1992–1995 | 6R5-11642-11-93 | Port side |
| Yamaha | 175BETO, 175TLRQ/TXRQ | 175 | 2-Stroke | 1992–1995 | 6R5-11642-11-93 | Port side |
| Yamaha | 200BETO, 200TJRQ/TLRQ/TXRQ, L200BETO, L200TXRQ, L200TRQ | 200 | 2-Stroke | 1992–1995 | 6R5-11642-11-93 | Port side |
| Yamaha | 225BET, 225BETO, 225TLRQ/TXRQ | 225 | 2-Stroke | 1992–1995 | 6R5-11642-11-93 | Port side |
Technical Specs
- Product Type
- Piston Kit
- Application Side
- Port Side
- Piston Diameter
- 90mm
- Piston Height
- 76.41mm
- Wrist Pin Diameter
- 23mm
- Material
- Aluminum Alloy
- Dimensions
- 90mm (diameter) × 76.41mm (height)
- Weight
- 0.71kg (1.56 lbs)
- Stroke Type
- 2-Stroke
- OEM Part Number
- 6R5-11642-11-93
- Warranty
- Manufacturer Standard Warranty
What’s in the Box
- 1 x Piston (Replaces 6R5-11642-11-93)
- 1 x Piston Ring Set
- 1 x Wrist Pin (Replaces 6R5-11633-10-00)
- 2 x Retaining Clips (Replaces 6R5-11634-10-00)
Installation Notes
- Consult your engine's service manual for all specifications and safety procedures. Disconnect the battery before starting.
- Remove the cylinder head and related components to access the piston assembly.
- Carefully extract the old piston, wrist pin, and retaining clips from the connecting rod.
- Inspect the cylinder wall for scratches, scoring, or an out-of-round condition. Hone the cylinder as needed to ensure a proper seal for the new rings.
- Install the new rings onto the new piston, ensuring they are in the correct groove and orientation.
- Attach the new piston to the connecting rod using the new wrist pin and secure it with the retaining clips.
- Generously lubricate the piston, rings, and cylinder wall with 2-stroke engine oil before insertion.
- Carefully compress the rings and guide the piston into the cylinder. Reassemble all engine components, torquing fasteners to the manufacturer's specifications.
Troubleshooting & FAQ
How do I know if this piston is for the port or starboard side?
This specific piston kit (6R5-11642-11-93) is designed for installation on the port side of compatible Yamaha V4 and V6 engines. Always verify part numbers for your specific application.
What are the signs of a failing piston?
Common symptoms include a noticeable loss of compression, increased oil consumption, unusual engine noises such as knocking or rattling, and excessive blue or white exhaust smoke.
Do I need to hone the cylinder when replacing the piston?
Yes, it is highly recommended. Honing creates a specific cross-hatch pattern on the cylinder wall that helps the new piston rings seat correctly, ensuring a proper seal, efficient lubrication, and optimal engine performance.
Is this a standard size or oversized piston?
This is a standard (STD) 90mm diameter piston. Oversized options are typically required only if the cylinder has been bored out to correct significant wear or damage.
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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