{"product_id":"cilindro-y-culata-italkit-74cc-derbi-variant-start-start-5-d-48mm-c-40","title":"Italkit Cylinder and cylinder head 74cc Derbi Variant Start \/ Start 5 d.48mm c.40","description":"\u003cp\u003e\u003cstrong\u003eCylinder\u003c\/strong\u003e and cylinder head 74cc d.48mm stroke 40mm from manufacturer \u003cstrong\u003eItalkit\u003c\/strong\u003e for \u003cstrong\u003eDerbi\u003c\/strong\u003e Variant Start \/ Start 5.\u003c\/p\u003e\n\u003cp\u003eThis \u003cstrong\u003eItalkit 74cc engine kit\u003c\/strong\u003e is the solution for those looking to give their \u003cstrong\u003eDerbi Variant Start\u003c\/strong\u003e or \u003cstrong\u003eStart 5\u003c\/strong\u003e more \u003cstrong\u003epower\u003c\/strong\u003e and allow the \u003cstrong\u003eengine to rev higher\u003c\/strong\u003e without getting into machining work. By moving to a \u003cstrong\u003e48mm bore\u003c\/strong\u003e, you increase the displacement while keeping the \u003cstrong\u003eoriginal 40mm stroke crankshaft.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is necessary to replace the original cylinder when you notice the bike has lost \u003cstrong\u003ecompression\u003c\/strong\u003e or if you want extra \u003cstrong\u003epower\u003c\/strong\u003e for smoother riding. This kit is made of \u003cstrong\u003ealuminium with Nikasil coating\u003c\/strong\u003e, a material that \u003cstrong\u003edissipates heat better\u003c\/strong\u003e than iron and reduces friction, preventing seizures and ensuring the engine runs at a stable temperature even under \u003cstrong\u003ehigh RPM\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe design with \u003cstrong\u003e6 transfer ports\u003c\/strong\u003e and the \u003cstrong\u003eexhaust port with 2 venturis\u003c\/strong\u003e improves chamber filling, achieving \u003cstrong\u003emore efficient combustion\u003c\/strong\u003e and a much fuller \u003cstrong\u003ethrottle response\u003c\/strong\u003e across the entire range. In addition, it includes a \u003cstrong\u003especial two-piece cylinder head\u003c\/strong\u003e that guarantees a \u003cstrong\u003eperfect seal\u003c\/strong\u003e and perfect alignment thanks to its integrated guides, preventing \u003cstrong\u003egas leaks\u003c\/strong\u003e and ensuring that the \u003cstrong\u003eexplosion force\u003c\/strong\u003e is fully utilised.\u003c\/p\u003e\n\u003cp\u003eFor maximum \u003cstrong\u003eperformance\u003c\/strong\u003e we recommend fitting a larger carburettor, a reed valve and an exhaust.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 74cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 48 millimetres\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 40 millimetres (original)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Al-Si aluminium alloy with heat treatment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Nickel-Silicon (Nikasil)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorting:\u003c\/strong\u003e 6 transfers and exhaust with 2 venturis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston:\u003c\/strong\u003e 2 high-quality rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder head:\u003c\/strong\u003e Two-piece with centring guides\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible models\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDERBI\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVARIANT START\u003c\/li\u003e\n\u003cli\u003eVARIANT START 5\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Italkit","offers":[{"title":"Default Title","offer_id":55515240137089,"sku":"CK.12.578.G","price":279.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0860\/6223\/5959\/files\/CK.12.578.G.webp?v=1776333180","url":"https:\/\/motoscoot.net\/en\/products\/cylinder-and-italkit-74cc-cylinder-head-derbi-variant-start-start-5-d-48mm-c-40","provider":"Motoscoot","version":"1.0","type":"link"}