{"product_id":"cylinder-kit-stage6-big-racing-77cc-derbi-euro-3-4","title":"Cylinder Kit Stage6 Big Racing 77cc Derbi Euro 3 \/ 4","description":"\u003cp\u003eStage6 Big Racing 77cc cylinder kit delivers serious performance for Derbi Euro 3 and Euro 4 50cc motorcycles. \u003cbr\u003e\u003cbr\u003eDeveloped in partnership with MXS Racing professionals, this genuine big bore aluminum cylinder — not a simple bored-out standard — features matched transfer ports and an enlarged exhaust port engineered for maximum power. The kit produces 23 hp and 13 Nm on the dyno with standard setup, while optimized port timings (190°–125°), generous cooling volume, and a quality Vertex piston ensure durability.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePiston pin = 12 mm\u003c\/li\u003e\n\u003cli\u003eStroke = Original\u003c\/li\u003e\n\u003cli\u003eConrod length = Standard\u003c\/li\u003e\n\u003cli\u003eSpark plug thread = M14 long\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation requires no engine block milling \u003c\/strong\u003eand squish clearance is pre-optimized for your engine type.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes 77cc aluminum cylinder with 5 transfer ports and bridged exhaust\u003c\/li\u003e\n\u003cli\u003e50mm Vertex piston\u003c\/li\u003e\n\u003cli\u003eone-piece aluminum high-compression head\u003c\/li\u003e\n\u003cli\u003egasket set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote : Euro 4 models require adapter MF96.91010 for temperature sensor fitment. Not street legal. Please, use with reinforced crankshaft at standard stroke. Long cylinder head nuts recommended for proper assembly.\u003c\/p\u003e","brand":"STAGE6","offers":[{"title":"Default Title","offer_id":58333023076687,"sku":"S6-7019310","price":259.47,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0918\/7626\/2223\/files\/MOPEDI.LV-2026-07-28T195329.238.jpg?v=1785257721","url":"https:\/\/www.mopedi.lv\/products\/cylinder-kit-stage6-big-racing-77cc-derbi-euro-3-4","provider":"MOPEDI LATVIA","version":"1.0","type":"link"}