Yamaha 7FK-11635-00-00 - Piston (0.25MM O-S) is a genuine Yamaha part. This engine part is one of the internal components that keep the engine running as designed. Use part number 7FK-11635-00-00 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 0.25MM O-S as listed by Yamaha; confirm the required size with service manual measurements.

---

Frequently Asked Questions

Is 7FK-11635-00-00 a genuine Yamaha part?

Yes. 7FK-11635-00-00 is the Yamaha part number for the Piston (0.25MM O-S). It replaces a worn or damaged engine component with the specified Yamaha part.

What does the 0.25MM O-S size on part 7FK-11635-00-00 mean?

O-S marks an oversize part and U-S an undersize part. Yamaha lists 7FK-11635-00-00 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.

Where does the Piston (0.25MM O-S), part 7FK-11635-00-00, fit in the engine?

The Piston (0.25MM O-S) installs in the engine location shown for part 7FK-11635-00-00 in the Yamaha parts diagram for your model.

---

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.