{"product_id":"kibblewhite-80-81900-top-end-rebuild-kit-with-white-diamond-valves-for-yamaha-wr450f-and-yz450f","title":"Kibblewhite Top End Rebuild Kit with White Diamond Valves for Yamaha WR450F and YZ450F (80-81900)","description":"\u003cp\u003eRestore top-end performance with the Kibblewhite 80-81900 Top End Kit, engineered as a complete piston and valve service solution for select Yamaha WR450F and YZ450F applications. This kit combines matched internal components to support a reliable rebuild, including performance pistons, piston rings, piston pins, White Diamond® valves, valve springs, gaskets, seals, O-rings, and related installation hardware. The components are designed to work together as a system rather than as individually selected OEM replacements.\u003cbr\u003eThe pistons are machined from high-strength 2618 aluminum alloy and feature a performance skirt coating to promote smooth operation and durability in demanding riding conditions. The included piston rings, piston pins, and pin clips are matched to the piston kit for proper compatibility. White Diamond® valves provide a performance-focused upgrade for the cylinder head, while the complete gasket and sealing package helps simplify top-end assembly and service.\u003cbr\u003eThe Kibblewhite valve spring package includes lightweight racing springs, titanium retainers, dual springs, and heat-treated steel base washers. The springs are suitable for use with high-performance camshafts and are intended for applications requiring dependable valve control at elevated engine speeds. Before installation, verify vehicle fitment, engine configuration, and camshaft compatibility to ensure the components match the intended build.\u003cbr\u003eThis Kibblewhite top-end kit is not compatible with OEM components. Professional installation and careful inspection of cylinder, head, camshaft, and related engine parts are recommended during assembly. Use the Kibblewhite 80-81900 kit when replacing the complete top-end system and seeking coordinated piston, valve, spring, and sealing components for a Yamaha WR450F or YZ450F performance rebuild.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eComplete top-end service and rebuild kit with pistons, piston rings, piston pins, gaskets, valves, valve springs, seals, O-rings, and installation hardware\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e2618 aluminum alloy pistons with performance skirt coating for strength and reduced friction\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMatched pistons, rings, valves, piston pins, and pin clips designed to function together as a system\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eWhite Diamond® valves for performance-oriented cylinder head service\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eLightweight racing valve spring kit with titanium retainers, dual springs, and heat-treated steel base washers\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eValve springs suitable for use with high-performance camshafts\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eNot compatible with OEM components\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eApplication-specific fitment for select Yamaha WR450F and YZ450F models\u003c\/li\u003e\u003c\/ul\u003e\r\n\u003cp\u003eShips from Parts Unlimited.\u003c\/p\u003e","brand":"Kibblewhite","offers":[{"title":"Default Title","offer_id":60117745697054,"sku":"80-81900","price":736.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1091\/7884\/7518\/files\/30841.png?v=1791111866","url":"https:\/\/shoplepier.com\/products\/kibblewhite-80-81900-top-end-rebuild-kit-with-white-diamond-valves-for-yamaha-wr450f-and-yz450f","provider":"LEPIER POWERSPORTS","version":"1.0","type":"link"}