{"product_id":"namura-piston-rings-fits-kawasaki-1986-1991-js-300-sx-300-020-over-bore-76-5mm","title":"Namura Piston Rings fits Kawasaki 1986-1991 JS 300, SX 300 .020 Over Bore 76.5mm","description":"\u003ch2\u003ePiston Rings for for Namura\u003c\/h2\u003e\u003cp\u003eThese piston rings for for Namura provide a precise seal for Kawasaki JS 300 and SX 300 jet ski engines with a 76.5mm .020 over bore. The Namura piston rings maintain necessary cylinder pressure and reduce oil consumption for high-performance watercraft. These Namura piston rings are essential for achieving a proper seal during a cylinder re-bore or engine rebuild.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThese oversized rings are built for professional-grade engine rebuilds on vintage personal watercraft. They provide excellent tension and sealing properties to restore lost horsepower to the 300cc engine. These Namura piston rings meet or exceed factory requirements for durability and fit.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDesigned for .020 over bore engines at 76.5mm diameter.\u003c\/li\u003e\n\u003cli\u003eFeatures heat-resistant alloy for marine engine environments.\u003c\/li\u003e\n\u003cli\u003ePrecision-ground for quick seating against the cylinder wall.\u003c\/li\u003e\n\u003cli\u003eProvides superior blow-by control to maximize torque.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Kawasaki JS 300 1986-1991\u003c\/li\u003e\n\u003cli\u003efor Kawasaki SX 300 1986-1991\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRestoring compression after boring the cylinder oversized.\u003c\/li\u003e\n\u003cli\u003eCompleting top-end rebuilds on classic Kawasaki jet skis.\u003c\/li\u003e\n\u003cli\u003eEnsuring reliable power output for competitive or recreational use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e76.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Are these rings pre-gapped? \u003cstrong\u003eA:\u003c\/strong\u003e Always verify the ring end gap in the cylinder before final installation as specifications may vary. \u003cstrong\u003eQ:\u003c\/strong\u003e Can these be used on standard bore cylinders? \u003cstrong\u003eA:\u003c\/strong\u003e No, these are specifically designed for a .020 over bore and will not seal correctly on standard cylinders.\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":44792250138710,"sku":"SZ1F01714","price":30.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_1b1a1256-d5aa-4fa0-9263-cae12f20a847.jpg?v=1780064629","url":"https:\/\/www.solidspare.com\/products\/namura-piston-rings-fits-kawasaki-1986-1991-js-300-sx-300-020-over-bore-76-5mm","provider":"Solid Spare","version":"1.0","type":"link"}