{"product_id":"kit-cilindro-polini-big-valve-50cc-minarelli-vertical-b-10mm","title":"Polini Big Valve 50cc Minarelli Vertical kit b.10mm Cylinder ","description":"\u003cp\u003e\u003cstrong\u003eCylinder kit with Ø40 mm cast iron cylinder and piston with 10 mm gudgeon pin Polini Big Valve 50cc\u003c\/strong\u003e for \u003cstrong\u003eMinarelli Vertical\u003c\/strong\u003e engines.\u003c\/p\u003e\n\u003cp\u003eThe most interesting part of this kit is the \u003cstrong\u003eBig Valve intake integrated into the cylinder\u003c\/strong\u003e. It uses a \u003cstrong\u003e4-petal\u003c\/strong\u003e reed box that allows the engine to draw in the mixture more easily, especially when it starts operating at high RPM.\u003c\/p\u003e\n\u003cp\u003ePolini also works on the internal ducts to better direct the mixture towards the transfers. This helps achieve \u003cstrong\u003ebetter cylinder filling, more response when opening the throttle, and a higher top speed\u003c\/strong\u003e, while maintaining the 50cc displacement.\u003c\/p\u003e\n\u003cp\u003eThe cylinder is made of \u003cstrong\u003ecast iron\u003c\/strong\u003e and uses a two-ring piston. The kit also includes a \u003cstrong\u003ecylinder head, reed box, intake gaskets, and 360° adjustable intake manifold\u003c\/strong\u003e, making it easier to position the carburettor according to the installation.\u003c\/p\u003e\n\u003cp\u003ePolini recommends working with a \u003cstrong\u003eSquish of 0.8-0.9 mm\u003c\/strong\u003e, keeping the original ignition timing, and using an \u003cstrong\u003eNGK Spark plug with heat range 9\u003c\/strong\u003e. As a baseline for carburetion, it proposes a \u003cstrong\u003ePolini CP 19 with original airbox\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Polini.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange:\u003c\/strong\u003e Big Valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e 166.0118\/10.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e Minarelli Vertical 2-Stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 50cc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 40 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 39.2 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnecting rod:\u003c\/strong\u003e 80 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGudgeon pin:\u003c\/strong\u003e 10 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder material:\u003c\/strong\u003e cast iron.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston:\u003c\/strong\u003e 2 rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake:\u003c\/strong\u003e 4-petal Big Valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManifold:\u003c\/strong\u003e 360° adjustable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Squish:\u003c\/strong\u003e 0.8-0.9 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTiming:\u003c\/strong\u003e original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark plug:\u003c\/strong\u003e NGK heat range 9.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended carburetion setting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburettor:\u003c\/strong\u003e Polini CP 19.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter:\u003c\/strong\u003e original airbox.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain jet:\u003c\/strong\u003e 90.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdle jet:\u003c\/strong\u003e 40.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve:\u003c\/strong\u003e Ø25\/30.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeedle:\u003c\/strong\u003e 14\/22 - 2nd notch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAtomiser:\u003c\/strong\u003e 2.7.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloat:\u003c\/strong\u003e 5 g.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMBK\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBooster 50 2-Stroke\u003c\/li\u003e\n\u003cli\u003eStunt 50 2-Stroke\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eYAMAHA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBW's 50 2-Stroke\u003c\/li\u003e\n\u003cli\u003eSlider 50 2-Stroke\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e the carburetion indicated by Polini is a starting point for its recommended setup. If the exhaust, filter, or carburettor is changed, it will be necessary to readjust the mixture.\u003c\/p\u003e","brand":"Polini Motori s.p.a.","offers":[{"title":"Default Title","offer_id":68153547981191,"sku":"166.0118\/10","price":226.51,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0860\/6223\/5959\/files\/166.0118-10.webp?v=1794215564","url":"https:\/\/motoscoot.net\/en\/products\/kit-cylinder-polini-big-valve-50cc-minarelli-vertical-d-10mm","provider":"Motoscoot","version":"1.0","type":"link"}