{"product_id":"athena-s4f05400017c-piston-kit-for-yamaha-yz125","title":"Athena Piston Kit for Yamaha YZ125 (S4F05400017C)","description":"\u003cp\u003eUpgrade the performance and durability of your Yamaha YZ125 with the ATHENA S4F05400017C Piston Kit. Designed for demanding two-stroke applications, this piston kit is engineered to withstand high mechanical and thermal stresses while supporting consistent performance during intense riding and racing conditions. Its construction has been tested on engine dynamometer benches under progressive stress loads and subsequently validated on the track to confirm reliable operation in extreme environments.\u003cbr\u003eThe ATHENA S4F05400017C is manufactured using a reverse extrusion process that supports strength, precision, and dependable fitment in the original equipment cylinder. The included piston rings are designed to reduce friction against the OE cylinder, helping improve power delivery, engine efficiency, and overall operating performance. This kit is intended for Yamaha YZ125 applications requiring a 53.97 mm piston size.\u003cbr\u003eBuilt for riders and technicians who demand dependable replacement components, the ATHENA piston kit combines tested materials, precise manufacturing, and application-specific design. It is a practical choice for restoring engine performance during a rebuild or replacing worn piston components while retaining compatibility with the original cylinder. Always verify model-year fitment and service specifications before installation.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eHigh resistance to mechanical and thermal stresses\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eTested on engine dynamometer benches under progressive stress loads\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eTrack-tested for performance in extreme riding conditions\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003ePiston rings designed to reduce friction against the OE cylinder\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSupports improved engine performance and power delivery\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eManufactured using a reverse extrusion process\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned for use with the OE cylinder\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e53.97 mm piston size for Yamaha YZ125 applications\u003c\/li\u003e\u003c\/ul\u003e\r\n\u003cp\u003eShips from Parts Unlimited.\u003c\/p\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":60117709652254,"sku":"S4F05400017C","price":130.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1091\/7884\/7518\/files\/16629.png?v=1791109745","url":"https:\/\/shoplepier.com\/products\/athena-s4f05400017c-piston-kit-for-yamaha-yz125","provider":"LEPIER POWERSPORTS","version":"1.0","type":"link"}