{"product_id":"57-4mm-scooter-piston-kit","title":"57.4mm Scooter Piston Kit – Pedal Motorcycle Engine Piston with Piston Rings \u0026 Piston Pin","description":"\u003ch2\u003e57.4mm Scooter Piston Kit with Piston Rings and Piston Pin\u003c\/h2\u003e\n\u003cp\u003eThis 57.4mm scooter piston kit is a replacement piston set for pedal-type scooters and step-through motorcycles with a 57.4 mm cylinder bore. You get an aluminum alloy piston, a full set of piston rings and the piston pin, which covers the parts that wear out first when a small four-stroke engine starts losing compression or burning oil. Easy Life Markets sells it as one complete kit so you can refresh the piston side of your top end in one go.\u003c\/p\u003e\n\n\u003cp\u003e\"Pedal motorcycle\" is the name many parts suppliers use for scooters with a flat floorboard, where you rest your feet on the deck instead of on pegs. If that describes your bike and the cylinder measures 57.4 mm, this is the size to look at.\u003c\/p\u003e\n\n\u003ch2\u003eWhat the Piston Kit Does\u003c\/h2\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Piston\" target=\"_blank\" rel=\"noopener\"\u003episton\u003c\/a\u003e takes the force of combustion and passes it through the pin and connecting rod to the crankshaft. The rings around it do two jobs: the top rings seal the combustion chamber so you keep compression, and the oil control ring manages the film of oil on the cylinder wall. When the rings wear or stick, you get the familiar symptoms:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHard starting, especially when the engine is cold\u003c\/li\u003e\n\u003cli\u003eWeak acceleration and a lower top speed than you are used to\u003c\/li\u003e\n\u003cli\u003eBlue or grey smoke from the exhaust\u003c\/li\u003e\n\u003cli\u003eOil level dropping between changes\u003c\/li\u003e\n\u003cli\u003eLow readings on a compression test\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReplacing the piston and rings together is the usual fix when the cylinder itself is still within spec. If the cylinder wall is scored or worn oversize, you will need a new cylinder or a rebore as well.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAluminum alloy piston body\u003c\/li\u003e\n\u003cli\u003eCombination ring set, with a steel strip combined oil ring for oil control\u003c\/li\u003e\n\u003cli\u003ePiston pin included, so you are not reusing a worn pin in a new piston\u003c\/li\u003e\n\u003cli\u003eSized for a 57.4 mm cylinder diameter\u003c\/li\u003e\n\u003cli\u003eTotal piston height of 37 mm for easy comparison with your old part\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat Is Included\u003c\/h2\u003e\n\u003cp\u003eThe listing is for one piston kit. As shown in the product photos, that is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1 x piston\u003c\/li\u003e\n\u003cli\u003e1 x set of piston rings (compression rings and a combined oil ring)\u003c\/li\u003e\n\u003cli\u003e1 x piston pin\u003c\/li\u003e\n\u003cli\u003e2 x piston pin circlips\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Scooter \/ motorcycle engine piston kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder diameter (bore):\u003c\/strong\u003e 57.4 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal piston height:\u003c\/strong\u003e 37 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston material:\u003c\/strong\u003e Aluminum alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing structure:\u003c\/strong\u003e Combination ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil ring type:\u003c\/strong\u003e Steel strip combined oil ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e CJYD195065402BY\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Check Fitment Before You Order\u003c\/h2\u003e\n\u003cp\u003eScooter engines are made by many factories, and two engines that look the same can use different pistons. The safest way to buy a 57.4mm scooter piston kit is to measure what you already have:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure the bore.\u003c\/strong\u003e Use a bore gauge or a good caliper across the cylinder. You are looking for 57.4 mm. 57.4 mm is a common stock bore on many 150cc four-stroke scooter engines, but that alone does not confirm fit, so measure your own engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure the old piston.\u003c\/strong\u003e Check the diameter across the skirt and the total height (this one is 37 mm). Compare the crown shape and valve pockets with our photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the pin.\u003c\/strong\u003e Measure the diameter of your old piston pin and compare it with the pin shown here. The pin must match the small end of your connecting rod.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLook for oversize markings.\u003c\/strong\u003e If your engine has been bored before, the old piston may be stamped with an oversize figure. In that case, a standard 57.4 mm kit will not fit.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eWhen your measurements line up, you know you are ordering the right part. If anything is unclear, send us your numbers first.\u003c\/p\u003e\n\n\u003ch2\u003eFitting Tips\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eClean the cylinder and check it for scoring or a lip at the top of the ring travel.\u003c\/li\u003e\n\u003cli\u003eCheck the \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Piston_ring\" target=\"_blank\" rel=\"noopener\"\u003episton ring\u003c\/a\u003e end gaps in the cylinder before fitting them to the piston.\u003c\/li\u003e\n\u003cli\u003eFit the oil ring first, then the second and top compression rings, with any markings facing up and the gaps spread around the piston.\u003c\/li\u003e\n\u003cli\u003eMake sure the arrow or mark on the piston crown faces the correct direction, usually toward the exhaust side.\u003c\/li\u003e\n\u003cli\u003eSeat both circlips fully in their grooves, and cover the crankcase opening while you do it so nothing drops inside.\u003c\/li\u003e\n\u003cli\u003eUse new gaskets on reassembly, and ride gently for the first stretch while the rings bed in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts to Check While the Engine Is Open\u003c\/h2\u003e\n\u003cp\u003eWith the cylinder off, take a few minutes to inspect the rest of the top end. Replace the head and base gaskets, check the cam chain and tensioner, and clean carbon from the combustion chamber and valves. It is also worth cleaning or replacing the air filter, because dust getting past a worn filter is a common reason pistons and rings wear out early.\u003c\/p\u003e\n\n\u003ch2\u003eWho Needs This Kit\u003c\/h2\u003e\n\u003cp\u003eThis kit is a good choice for scooter owners doing a top-end refresh at home, small repair shops that service commuter scooters, and delivery riders who need to get a bike back on the road without replacing the whole engine. It is also a sensible spare to keep on the shelf if you run a scooter with this bore size every day.\u003c\/p\u003e\n\n\u003ch2\u003eBuy a 57.4mm Scooter Piston Kit from Easy Life Markets\u003c\/h2\u003e\n\u003cp\u003eYou can order this piston kit right here. The current price and availability are shown on this page. If you want help confirming fit, \u003ca href=\"\/pages\/contact\"\u003econtact us\u003c\/a\u003e with your engine details and measurements. Our \u003ca href=\"\/pages\/return-refund-policy\"\u003ereturn and refund policy\u003c\/a\u003e is available to read before you order.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sdh150-cylinder-kit\"\u003eSDH150 cylinder kit with 57.3mm cylinder, piston, rings and gaskets\u003c\/a\u003e if your cylinder needs replacing too\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/gy6-125cc-piston-kit\"\u003eGY6 125cc piston kit\u003c\/a\u003e for GY6-type scooter engines\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/64mm-motorcycle-piston-kit\"\u003e64mm motorcycle piston kit\u003c\/a\u003e for larger horizontal engines\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/gy6-50-80-crankshaft-power-car\"\u003eGY6 50\/80 crankshaft\u003c\/a\u003e for smaller scooter engine rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee every piston we carry in our \u003ca href=\"\/collections\/pistons\"\u003epistons collection\u003c\/a\u003e, pick up new gaskets from our \u003ca href=\"\/collections\/gaskets\"\u003egaskets range\u003c\/a\u003e, or browse more \u003ca href=\"\/collections\/engine-parts\"\u003eengine parts\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Photos\u003c\/h2\u003e\n\u003cp\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/17055360\/2401180236130329200.jpg\" alt=\"57.4mm scooter piston kit\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/17055360\/2401180236140320100.jpg\" alt=\"57.4mm scooter piston kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/17055360\/2401180236140320500.jpg\" alt=\"57.4mm scooter piston kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/17055360\/2401180236140320900.jpg\" alt=\"57.4mm scooter piston kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/17055360\/2401180236140321400.jpg\" alt=\"57.4mm scooter piston kit detail\" style=\"max-width:100%;\"\u003e\n\u003c\/p\u003e","brand":"easylife markets","offers":[{"title":"Engine piston","offer_id":46969651069089,"sku":"CJYD195065402BY","price":107.47,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/2086\/9537\/files\/45554894-b6e8-4116-bbf4-bc54d2626ad6.jpg?v=1788563546","url":"https:\/\/easylifemarketplace.com\/products\/57-4mm-scooter-piston-kit","provider":"Easy Life Markets","version":"1.0","type":"link"}