{"product_id":"411-hxr-5500","title":"Big Bore Kit - 88cc W\/Cam \/ XR\/CRF50, 00-Present","description":"\u003cdiv class=\"bbr-description\"\u003e\u003cp\u003eImpressive Power. Engineered and developed by BBR. This cylinder retains skid plate mounts and includes: BBR aluminum cylinder, piston kit, exclusive BBR motocross-grind camshaft and gasket kit. Easy bolt-on instructions included. The most reliable kit available. Runs great with stock carb or bolt on BBR's 18mm carb kit.\u003cbr\u003e\u003cbr\u003eAlso fits 1988-1999 Z50R with short piston.\u003c\/p\u003e\u003c\/div\u003e\u003cbr\u003e\u003cdiv class=\"bbr-bullet-points\"\u003e\u003cul class=\"bbr-ul\"\u003e\n\u003cli\u003eCylinder retains skid plate mounts\u003c\/li\u003e\n\u003cli\u003eBBR aluminum cylinder\u003c\/li\u003e\n\u003cli\u003e52mm piston specially designed to work with your stock cylinder head's combustion chamber\u003c\/li\u003e\n\u003cli\u003eMX-grind camshaft\u003c\/li\u003e\n\u003cli\u003eGasket kit\u003c\/li\u003e\n\u003cli\u003eEasy bolt-on instructions included\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\u003cbr\u003e\u003cdiv class=\"bbr-additional-info\"\u003e\u003cp\u003e\u003cb\u003eInstallation Note:\u003c\/b\u003e This kit will not work with the Honda XR\/CRF70 or other big port cylinder heads.  It is designed for the tiny combustion chamber of the OEM Honda XR\/CRF50 cylinder head.  The flat top piston dome will result in an extremely low compression ratio when combined with the XR\/CRF70 type cylinder head.  The result is a motor that makes less horsepower than stock.  This is the correct \u003ca target=\"_self\" href=\"\/products\/411-HXR-7001\"\u003eBBR bore kit for the XR\/CRF70\u003c\/a\u003e. \u003cbr\u003e\u003cbr\u003e\u003ca target=\"_blank\" href=\"http:\/\/www.bbrmotorsports.com\/Tech\/FAQ\/Documents\/JettingChart.htm\"\u003e\u003cbr\u003eBBR General Jetting Guidelines Chart\u003c\/a\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cbr\u003e","brand":"BBR","offers":[{"title":"Default Title","offer_id":50104704205077,"sku":"411-HXR-5500","price":175.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1205\/7200\/files\/411-HXR-5500_A_Large_43777e08-6981-426a-8c2d-15e9e3cb4381.jpg?v=1787171070","url":"https:\/\/www.factoryminibikes.com\/products\/411-hxr-5500","provider":"Factory Minibikes","version":"1.0","type":"link"}