Yamaha YF1-26572-10-91 - Piston Ring Set (2ND O-S) is a genuine Yamaha part. It is an internal engine component built to Yamaha's specification. Use part number YF1-26572-10-91 to confirm it matches the component shown in your model's Yamaha parts diagram.

---

Key Features & Benefits

• Installs in the position shown in the Yamaha engine parts diagram.
• Built to Yamaha's specification for its engine location.
• Replaces worn, scored, or damaged engine components.
• Size designation 2ND O-S as listed by Yamaha; confirm the required size with service manual measurements.

---

Frequently Asked Questions

Is YF1-26572-10-91 a genuine Yamaha part?

Yes. YF1-26572-10-91 is the Yamaha part number for the Piston Ring Set (2ND O-S). This engine part is one of the internal components that keep the engine running as designed.

What does the 2ND O-S size on part YF1-26572-10-91 mean?

O-S marks an oversize part and U-S an undersize part. Yamaha lists YF1-26572-10-91 as 2ND O-S, which is used when the mating part has been machined or worn to match. Measure and confirm the required size using the Yamaha service manual.

How do I confirm YF1-26572-10-91 fits my Yamaha?

Model fitment is not listed for part YF1-26572-10-91 on this page. Compare the part number against the Yamaha parts diagram for your model and year, or confirm with a Yamaha dealer using your model or VIN before ordering.

---

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.