Mercury Quicksilver NEW OEM Piston Ring Set 39-817869A3 2-Stroke NOS 0810

Mercury OEM Piston Ring Set — Part Number 39-817869A3

Brand: Mercury Marine | Condition: New Old Stock (NOS)

You are purchasing a genuine Mercury OEM Piston Ring Set, part number 39-817869A3. This factory piston ring set provides the compression and oil control rings required to restore proper cylinder sealing in Mercury 2-stroke outboard engines during engine rebuilds or overhaul — ensuring correct compression, preventing blow-by, controlling oil consumption, and restoring lost power and performance. Each set contains the rings for one cylinder. This is an authentic factory original part — never installed, never used.

Condition Details: This is a New Old Stock (NOS) part. The ring set itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

⚠ Important: Piston rings are application-specific. Verify your engine's model, serial number, cylinder bore size, and whether standard or oversize rings are required before ordering. Ring sets are typically non-returnable once installed.

Part Number / Supersede Information:

• Primary OEM Part Number: 39-817869A3
• Earlier revisions of this part: 39-817869A1, 39-817869A2
• This part number may have been further superseded by an updated Mercury part number. We recommend verifying any current supersede numbers through your local Mercury dealer or the official Mercury parts catalog prior to ordering.

Compatible Equipment: Mercury 2-stroke outboard motors — verify specific model, serial number, horsepower, cylinder configuration, and bore size fitment through your local Mercury Marine dealer or the official Mercury parts catalog prior to ordering.

Why Choose OEM Parts? OEM parts are engineered and manufactured to exact factory tolerances, ensuring a precise fit, reliable performance, and long service life. Unlike aftermarket alternatives, OEM parts are designed specifically for your engine — no modifications, no guesswork.

Returns: We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience. Please verify fitment using your equipment's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!

QBS Parts, Inc. — Gardena, CA