{"product_id":"namura-size-b-46-96mm-piston-kit-yamaha-1993-2001-yz80-standard-bore-47mm","title":"Namura Size B (46.96mm) Piston Kit Yamaha 1993-2001 YZ80 Standard Bore 47mm","description":"\u003ch2\u003ePiston Kit Size B (46.96mm) for Yamaha\u003c\/h2\u003e\u003cp\u003eThis Namura piston kit size B (46.96mm) is a direct replacement standard bore piston assembly for Yamaha YZ80 models from 1993 through 2001, engineered to restore compression and power in two‑stroke engines with an OEM cross‑reference to the 47mm standard bore specification.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eDesigned as a size B (46.96mm) standard bore piston kit for Yamaha YZ80 motorcycles, this component delivers reliable performance for riders rebuilding their top end. The kit includes a precision‑machined piston, rings, wrist pin, and circlips, ensuring a complete refresh for the 47mm bore engine. It is an ideal choice for maintaining the Yamaha YZ80′s original power output.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eManufactured from high‑silicon aluminum alloy for strength and heat dissipation\u003c\/li\u003e\n\u003cli\u003ePrecision‑ground ring grooves reduce friction and improve seal\u003c\/li\u003e\n\u003cli\u003eIncludes a hardened steel wrist pin with a molybdenum‑disulfide coating\u003c\/li\u003e\n\u003cli\u003eCirclips are heat‑treated for secure retention under high RPM\u003c\/li\u003e\n\u003cli\u003eEach kit is weight‑matched for balanced engine operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha YZ80 (1993‑2001)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn‑The‑Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMotocross track racing requiring frequent top‑end rebuilds\u003c\/li\u003e\n\u003cli\u003eTrail riding where reliable two‑stroke performance is essential\u003c\/li\u003e\n\u003cli\u003eCompetitive youth racing classes using the YZ80 platform\u003c\/li\u003e\n\u003cli\u003eEngine restoration projects for vintage Yamaha dirt bikes\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\u003eSize B (46.96mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e46.96mm (standard bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStroke\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStock Yamaha YZ80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh‑silicon aluminum alloy\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 require any modifications to install? \u003cstrong\u003eA:\u003c\/strong\u003e No, it is a direct replacement for the standard bore; simply hone the cylinder to the correct clearance and assemble using fresh gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What ring end‑gap should be set for this piston? \u003cstrong\u003eA:\u003c\/strong\u003e Follow the factory service manual for the Yamaha YZ80—typically 0.008–0.012 inch for the top ring and 0.010–0.014 inch for the second ring.\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":44890359529558,"sku":"SZ1F10373","price":104.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_5acd8a42-24c7-4992-ab6b-21894dde947c.jpg?v=1781138298","url":"https:\/\/www.solidspare.com\/products\/namura-size-b-46-96mm-piston-kit-yamaha-1993-2001-yz80-standard-bore-47mm","provider":"Solid Spare","version":"1.0","type":"link"}