{"product_id":"namura-nx-40097k-standard-bore-top-end-kit-for-yamaha-yz65","title":"Namura NX-40097K Standard Bore Top End Kit for Yamaha YZ65","description":"\u003cp\u003eThe Namura NX-40097K Top End Kit is designed for 2018–2021 Yamaha YZ65 models and provides the essential components needed for a reliable top-end rebuild. This standard-bore kit includes a piston, piston rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit. It is engineered for the Yamaha YZ65 43.44 mm standard-bore application with an 11:1 compression ratio, supporting proper fitment and dependable engine performance.\u003c\/p\u003e\u003cp\u003eThe piston features MOS2, or Teflon\/molybdenum, coated skirts applied through a rolled-on process that creates a stronger bond than typical spray-on coatings. This coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and durability. The hypereutectic casting process adds silicon to help control expansion, increase wear resistance, and withstand elevated cylinder temperatures.\u003c\/p\u003e\u003cp\u003eDesigned as a comprehensive replacement solution, the Namura top-end kit helps simplify installation by supplying the major components required for piston replacement in one package. Verify the standard-bore specification, model year, and engine configuration before installation. The NX-40097K fits 2018, 2019, 2020, and 2021 Yamaha YZ65 motorcycles.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFitment: Designed for 2018–2021 Yamaha YZ65 motorcycles\u003c\/li\u003e\n\u003cli\u003eKit contents: Includes piston, rings, wrist pin, clips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003eBore and compression: Standard-bore 43.44 mm application with an 11:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eMOS2 coating: Rolled-on Teflon\/molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk\u003c\/li\u003e\n\u003cli\u003eMachined smooth head: Helps reflect combustion heat and reduce carbon buildup\u003c\/li\u003e\n\u003cli\u003eAnodized dome: Increases heat resistance and piston durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic construction: Higher silicon content helps reduce expansion and improve wear resistance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2018 Yamaha YZ65\u003cbr\u003e\n2019 Yamaha YZ65\u003cbr\u003e\n2020 Yamaha YZ65\u003cbr\u003e\n2021 Yamaha YZ65","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67559711932651,"sku":"185-4097","price":78.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/3ccc-5e961e8478a78.jpg?v=1790772832","url":"https:\/\/ctracingservices.com\/products\/namura-nx-40097k-standard-bore-top-end-kit-for-yamaha-yz65","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}