Yamaha YF1-26572-19-21 - Piston (0.25MM O-S) is a genuine Yamaha part. It is an internal engine component built to Yamaha's specification. Ordering by part number YF1-26572-19-21 ensures you receive the exact component Yamaha lists for its location.

---

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 0.25MM O-S as listed by Yamaha; confirm the required size with service manual measurements.

---

Frequently Asked Questions

What part does Yamaha number YF1-26572-19-21 refer to?

Yamaha number YF1-26572-19-21 identifies the Piston (0.25MM O-S), a genuine Yamaha part. This engine part is one of the internal components that keep the engine running as designed.

What does the 0.25MM O-S size on part YF1-26572-19-21 mean?

O-S marks an oversize part and U-S an undersize part. Yamaha lists YF1-26572-19-21 as 0.25MM 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 can I check that the Piston (0.25MM O-S), part YF1-26572-19-21, is the right part for my vehicle?

Find the Piston (0.25MM O-S) in the Yamaha parts diagram for your exact model and year and confirm the part number shown matches YF1-26572-19-21. A Yamaha dealer can also verify it with your model or VIN.

---

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.