{"product_id":"tekno-rc-tkr1729-inner-head-button","title":"Tekno RC TKR1729 Inner Head Button","description":"\u003ch3\u003eTekno RC TKR1729 – Inner Head (21aM\/aP\/bM)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Description:\u003c\/strong\u003e\u003cbr\u003eThe TKR1729 is the inner head, or head button, for Tekno RC's Blok .21 competition nitro engines. It sits between the piston and the outer cooling head and shapes the combustion chamber; replacing a worn or damaged head button restores compression and combustion geometry. Compatible with the 21aM, 21aP, and 21bM engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForms the combustion chamber above the piston\u003c\/li\u003e\n\u003cli\u003eRestores compression and combustion geometry\u003c\/li\u003e\n\u003cli\u003eCompatible with all three Blok engine variants\u003c\/li\u003e\n\u003cli\u003eNote: not eligible for Tekno's general warranty program\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Tekno Blok 21aM, 21aP, 21bM .21 nitro engines\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e 1 inner head (head button)\u003c\/p\u003e\n\u003cp\u003eA key part of restoring a Blok engine's compression during a rebuild.\u003c\/p\u003e","brand":"Tekno RC","offers":[{"title":"Default Title","offer_id":55854664220994,"sku":"TKR1729","price":49.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5063\/8402\/files\/TKR1729.jpg?v=1786221184","url":"https:\/\/www.powerhobby.com\/products\/tekno-rc-tkr1729-inner-head-button","provider":"PowerHobby","version":"1.0","type":"link"}