{"product_id":"sherco-piston-kit-250cc","title":"Sherco Piston Kit - 250cc","description":"\u003cp class=\"p1\"\u003eGenuine Sherco 250 piston kit, designed for compatible Sherco 250cc two-stroke trials motorcycles. Available in four piston grades (A, B, C and D) to suit different cylinder bore measurements.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eEach kit is supplied complete with piston rings, gudgeon pin and circlips, providing the essential components for replacing a worn or damaged piston during engine maintenance or a top-end rebuild.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003ePiston Sizes \u0026amp; Part Numbers\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"8\" width=\"100%\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003ePiston Grade\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eDiameter\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eSherco Part Number\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eA\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003e72.75mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eM009\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eB\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003e72.76mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eM586\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eC\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003e72.77mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eM587\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eD\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003e72.78mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp class=\"p1\"\u003eM588\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"p1\"\u003eSize A is the smallest piston grade and is commonly fitted from the factory, although this can vary. Each subsequent grade increases in diameter by 0.01mm.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe piston grade is marked on the crown for identification.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003ePiston diameters:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e 72.75–72.78mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eRecommended piston-to-cylinder clearance:\u003c\/b\u003e\u003c\/span\u003e 0.024–0.035mm (2009 Sherco specification)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003ePiston measurement position:\u003c\/b\u003e\u003c\/span\u003e 19mm above the bottom of the skirt\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eReference measurement temperature:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e 24°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eRequired little-end bearing:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e 18 × 22 × 22mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eChoosing the Correct Piston Size\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSelecting the correct piston grade is essential for maintaining the recommended piston-to-cylinder clearance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eCylinder wear may vary throughout the bore, so measurements should be taken at multiple points along its length and in both directions before selecting a replacement piston.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003ePistons are manufactured with a tapered and oval profile to accommodate thermal expansion during operation. For accurate sizing, the piston should be measured front to back, 19mm above the bottom of the skirt, at approximately 24°C.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWe recommend checking your existing piston grade and measuring the cylinder before ordering, particularly if considering moving to a larger piston size.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eCompatibility\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSuitable for Sherco 250cc two-stroke trials motorcycles using the M009\/M586\/M587\/M588 piston family.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eImportant:\u003c\/b\u003e These replacement pistons require an 18 × 22 × 22mm little-end bearing. The older Sherco M043 bearing is not compatible and must be replaced where fitted.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003ePlease Note\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eAlways confirm your existing piston grade, cylinder measurements and model compatibility before ordering. Piston grades should not be selected solely based on the age of the motorcycle or the size of the existing piston.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eIf you’re unsure which piston size you require, please contact Road and Trials for advice.\u003c\/p\u003e","brand":"Sherco","offers":[{"title":"A - 72.75mm","offer_id":60230562054528,"sku":"SHERCOM009","price":139.99,"currency_code":"GBP","in_stock":true},{"title":"B - 72.76mm","offer_id":60230562087296,"sku":"SHERCOM586","price":139.99,"currency_code":"GBP","in_stock":false},{"title":"C - 72.77mm","offer_id":60230562120064,"sku":"SHERCOM587","price":139.99,"currency_code":"GBP","in_stock":false},{"title":"D - 72.78mm","offer_id":60230562152832,"sku":"SHERCOM588","price":139.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/4039\/1730\/files\/Genuine_Sherco_parts_image_Road_and_Trials.png?v=1792502616","url":"https:\/\/roadandtrials.co.uk\/products\/sherco-piston-kit-250cc","provider":"Road and Trials","version":"1.0","type":"link"}