Piston Ring Set (0.25mm O/S) – Fits Yamaha 75-115HP Outboards (6D8-11604-10-00)
Piston Ring Set (0.25mm O/S) – Fits Yamaha 75-115HP Outboards (6D8-11604-10-00) 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 aftermarket Piston Ring Set (0.25mm O/S) – Fits Yamaha 75-115HP Outboards (6D8-11604-10-00) is designed for a range of Yamaha 75-115HP 4-Stroke outboard engines, including F75, F80, F90, F100, and F115 models. The 0.25mm oversize is intended for engine blocks that have been machined during a rebuild or repair.
It serves as a direct interchange for Yamaha part numbers 6D8-11604-10-00, 6D8-11604-11-00, 6D8-11604-00-00, 6D8-11604-01-00, 67F-11604-00-00, and 67F-11604-01-00.
- Engine Internal Component for Piston Assembly
- 0.25mm oversize for cylinder bore repair/rebuild
- Engineered for 4-Stroke outboard applications
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 6D8-11604-10-00 | 6D8-11604-11-00 |
| Yamaha | 6D8-11604-00-00 | 6D8-11604-01-00 |
| Yamaha | 67F-11604-00-00 | 67F-11604-01-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | F80 | 80 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
| Yamaha | F90 | 90 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
| Yamaha | F100 | 100 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
| Yamaha | F115 | 115 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
| Yamaha | FL115 | 115 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
| Yamaha | F75 | 75 | 4-Stroke | 6D8-11604-10-00 | Superseded by 6D8-11604-11-00 |
Technical Specs
- Product Type
- Piston Ring Set (Oversize)
- Installation
- Engine Internal Component
- Oversize Dimension
- 0.25mm Oversize
- Application
- Crankshaft/Piston Assembly
- Dimensions
- 8.5" x 0.5" x 8.5"
- Warranty
- Standard Yamaha Marine OEM Warranty
What’s in the Box
- 1 x Piston Ring Set (0.25mm O/S) (Replaces 6D8-11604-10-00)
Installation Notes
Installation of internal engine components is a complex task that should be performed by a qualified marine mechanic. Improper installation can lead to severe engine damage.
- Consult your engine's official service manual for detailed procedures.
- Disconnect the battery and all related electrical connections to prevent accidental starts.
- Drain the engine oil and coolant completely.
- Carefully remove the cylinder head and other components to access the pistons.
- Remove the old piston rings using a ring expander tool to avoid damaging the piston.
- Thoroughly clean the piston ring grooves, removing all carbon deposits and oil residue.
- Install the new rings in the correct order and orientation, ensuring the gaps are staggered per the manual's specifications.
- Lubricate the new rings and cylinder walls with fresh engine oil before reassembly.
- Reassemble all components, torquing bolts and fasteners to the manufacturer's specified values.
- Refill with new engine oil and coolant.
- Follow the recommended engine break-in procedure for new piston rings to ensure proper seating.
Troubleshooting & FAQ
How do I know if I need oversized piston rings?
Oversized piston rings are only necessary if your engine's cylinders have been machined (bored) to a larger diameter during a rebuild. This is typically done to correct for wear, tapering, or out-of-round conditions. Measurement by a professional mechanic is required to determine the correct oversize dimension needed.
What are the signs of failing piston rings?
Common symptoms of worn or damaged piston rings include excessive blue or white smoke from the exhaust, high oil consumption, loss of engine compression (leading to reduced power), and increased crankcase pressure (blow-by).
Can I install just one new piston ring set in my engine?
While possible, it is best practice to replace the rings for all cylinders at the same time. This ensures balanced compression and performance across the entire engine. Rebuilding only one cylinder can lead to imbalances.
Does this set include rings for all cylinders?
This part number corresponds to a ring set for a single piston. You will need to purchase one set for each cylinder you are rebuilding.
Is a special tool required for installation?
Yes, a piston ring expander is needed to safely remove and install rings without damaging them or the piston. A piston ring compressor is also essential for inserting the piston back into the cylinder.
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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