{"product_id":"namura-nx-40026-cka-top-end-kit-for-1995-1998-yamaha-yz250-67-96-mm-bore","title":"Namura NX-40026-CKA Top End Kit for 1995–1998 Yamaha YZ250, 67.96 mm Bore","description":"\u003cp\u003eThe Namura NX-40026-CKA Top End Kit is designed for reliable replacement and performance restoration on select 1995–1998 Yamaha YZ250 models. This complete kit includes a piston, piston rings, wrist pin, circlips, top-end bearing, and gasket kit, providing the primary components needed for a professional top-end rebuild. With a 67.96 mm piston size and an 11:1 compression ratio, it is engineered for dependable fitment and consistent operation in compatible Yamaha two-stroke engines.\u003c\/p\u003e\u003cp\u003eThe piston uses a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. The MOS2, or Teflon\/molybdenum, coated skirts use a rolled-on application process designed to create a stronger bond than conventional spray-on coatings. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizures during engine operation.\u003c\/p\u003e\u003cp\u003eMachined smooth heads help reflect combustion heat and reduce carbon buildup around the piston crown, supporting piston protection and efficient combustion. Anodized domes further improve heat resistance and durability, making the piston suitable for demanding off-road riding and motocross applications. The Namura NX-40026-CKA top-end kit fits 1995, 1996, 1997, and 1998 Yamaha YZ250 models. Verify the motorcycle year, model, cylinder condition, and required piston clearance before installation.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eComplete top-end kit includes piston, rings, wrist pin, circlips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003e67.96 mm piston size with an 11:1 compression ratio for compatible Yamaha YZ250 applications\u003c\/li\u003e\n\u003cli\u003eMOS2 Teflon\/molybdenum coated piston skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk\u003c\/li\u003e\n\u003cli\u003eMachined smooth piston heads help reflect combustion heat and reduce carbon buildup\u003c\/li\u003e\n\u003cli\u003eAnodized piston domes improve heat resistance and durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance\u003c\/li\u003e\n\u003cli\u003eFits 1995–1998 Yamaha YZ250 motorcycles\u003c\/li\u003e\n\u003cli\u003eBrand: Namura\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: NX-40026-CKA\u003c\/li\u003e\n\u003cli\u003eVendor part number: 185-4026CA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1995 Yamaha YZ250\u003cbr\u003e\n1996 Yamaha YZ250\u003cbr\u003e\n1997 Yamaha YZ250\u003cbr\u003e\n1998 Yamaha YZ250","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67559757283563,"sku":"185-4026CA","price":120.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/dd77-572a583cd9540_a24fe754-9e98-43c6-beda-be755ff181b6.jpg?v=1790772908","url":"https:\/\/ctracingservices.com\/products\/namura-nx-40026-cka-top-end-kit-for-1995-1998-yamaha-yz250-67-96-mm-bore","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}