{"product_id":"namura-size-c-piston-kit-for-ktm-50-sx-pro-jr-sr-mini-junior-std-bore-39-50mm","title":"Namura Size C Piston Kit for KTM 50 SX Pro Jr Sr Mini Junior STD Bore 39.50mm","description":"\u003ch2\u003ePiston Kit for KTM 50 SX\u003c\/h2\u003e\u003cp\u003eThis Namura Size C piston kit fits KTM 50 SX Pro Jr Sr Mini Junior models with a standard bore of 39.50mm, replacing worn pistons for restored performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Namura Size C piston kit is designed for KTM 50 SX mini dirt bikes including Pro, Jr, Sr, and Junior variants. It features a 39.50mm standard bore and includes piston rings and wrist pin. This kit restores compression and power in two‑stroke engines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision‑cast aluminum alloy construction\u003c\/li\u003e\n\u003cli\u003eIncludes piston rings and wrist pin\u003c\/li\u003e\n\u003cli\u003eMachined to exact 39.50mm bore size\u003c\/li\u003e\n\u003cli\u003eDesigned for high‑revving mini engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor KTM 50 SX Pro\u003c\/li\u003e\n\u003cli\u003efor KTM 50 SX Jr\u003c\/li\u003e\n\u003cli\u003efor KTM 50 SX Sr\u003c\/li\u003e\n\u003cli\u003efor KTM 50 SX Mini Junior\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eYouth motocross racing\u003c\/li\u003e\n\u003cli\u003eOff‑road practice and training\u003c\/li\u003e\n\u003cli\u003eEngine rebuild projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot applicable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e39.50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eC (Size C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this piston kit include a circlip? \u003cstrong\u003eA:\u003c\/strong\u003e It includes rings, wrist pin, and circlips; you may need to order a gasket set separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What oil ratio is recommended for break‑in? \u003cstrong\u003eA:\u003c\/strong\u003e Follow the KTM owner’s manual; typically 40:1 to 32:1 with high‑quality two‑stroke oil.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":44888514003030,"sku":"SZ1F09664","price":87.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_ed9c71be-8299-4802-971c-e44d03b7ee97.jpg?v=1781094553","url":"https:\/\/www.solidspare.com\/products\/namura-size-c-piston-kit-for-ktm-50-sx-pro-jr-sr-mini-junior-std-bore-39-50mm","provider":"Solid Spare","version":"1.0","type":"link"}