{"product_id":"namura-nx-10003k1-top-end-kit-53-94-mm-standard-bore-11-1-compression-for-honda-cr125r","title":"Namura NX-10003K1 Top End Kit 53.94 mm Standard Bore, 11:1 Compression for Honda CR125R","description":"\u003cp\u003eThe Namura NX-10003K1 Top End Kit is designed for select Honda CR125R two-stroke motorcycles from 2005 through 2007. This standard-bore kit includes a 53.94 mm piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit, providing the essential components for a reliable top-end rebuild. It is engineered to restore performance and support proper fitment with the original cylinder.\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. Its MOS2, or Teflon\/Molybdenum, coated skirts use a rolled-on application process intended 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 operation.\u003c\/p\u003e\u003cp\u003eMachined smooth heads help reflect combustion heat and reduce carbon buildup around the piston crown, while the anodized dome improves heat resistance and durability. The 11:1 compression ratio is matched to the listed application, supporting dependable engine operation when installed with the appropriate cylinder, components, and manufacturer specifications. The Namura NX-10003K1 is a practical replacement top-end solution for maintaining the performance and serviceability of compatible Honda CR125R models.\u003c\/p\u003e\u003cp\u003eFitment: Fits 2005 Honda CR125R, 2006 Honda CR125R, and 2007 Honda CR125R. Manufacturer part number: NX-10003K1. Vendor part number: 185-10031.\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, retaining clips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003eStandard Bore Fitment: Features a 53.94 mm piston designed for compatible Honda CR125R applications\u003c\/li\u003e\n\u003cli\u003eMOS2-Coated Skirts: 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 on the piston crown\u003c\/li\u003e\n\u003cli\u003eAnodized Dome: Improves heat resistance and durability for demanding engine conditions\u003c\/li\u003e\n\u003cli\u003eHypereutectic Construction: Higher silicon content helps reduce expansion, increase wear resistance, and withstand higher cylinder temperatures\u003c\/li\u003e\n\u003cli\u003e11:1 Compression Ratio: Designed to support the specified Honda CR125R engine configuration\u003c\/li\u003e\n\u003cli\u003eFitment: Compatible with 2005–2007 Honda CR125R models\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2005 Honda CR125R\u003cbr\u003e\n2006 Honda CR125R\u003cbr\u003e\n2007 Honda CR125R","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67561167651051,"sku":"185-10031","price":102.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/23ef-5e9627e50a36d.jpg?v=1790774867","url":"https:\/\/ctracingservices.com\/products\/namura-nx-10003k1-top-end-kit-53-94-mm-standard-bore-11-1-compression-for-honda-cr125r","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}