{"product_id":"804m06640-wiseco-std-piston-kit-for-yamaha-yz250x-2016-2024-66-40-mm","title":"804M06640 Wiseco Std Piston Kit for Yamaha YZ250X 2016-2024 66.40 mm","description":"\u003ch2\u003eWiseco Std Piston Kit for Yamaha YZ250X\u003c\/h2\u003e\u003cp\u003eThis Wiseco standard bore piston kit, cross-referenced as 804M06640 with a 66.40 mm bore, is a complete top-end replacement assembly engineered for the Yamaha YZ250X two-stroke engine.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco Std Piston Kit for Yamaha YZ250X delivers a direct-fit top-end rebuild solution for riders who demand consistent compression and reliability. The 66.40 mm standard bore piston kit for Yamaha YZ250X is built for trail and enduro riders running stock cylinder dimensions. Each Wiseco Std Piston Kit for Yamaha YZ250X ships with the piston, rings, pin, and clips needed to complete the job.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged high-silicon aluminum alloy construction for strength under high combustion loads\u003c\/li\u003e\n\u003cli\u003eStandard 66.40 mm bore size matches the OEM cylinder dimension without overboring\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves for consistent ring seal and compression\u003c\/li\u003e\n\u003cli\u003eKit includes piston, rings, wrist pin, and circlips for a complete top-end refresh\u003c\/li\u003e\n\u003cli\u003eThermal expansion characteristics tuned for two-stroke enduro duty cycles\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ250X 2016\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2017\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2018\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2019\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2020\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2021\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2022\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2023\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X 2024\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eScheduled top-end rebuilds on high-hour YZ250X enduro machines\u003c\/li\u003e\n\u003cli\u003eRestoring lost compression after ring wear or piston scuffing\u003c\/li\u003e\n\u003cli\u003ePre-season freshening before long trail or hare scramble events\u003c\/li\u003e\n\u003cli\u003eReplacing a seized or scored piston on a stock-bore cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e804M06640\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e66.40 mm standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged, single ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo-stroke top-end rebuild\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this kit require cylinder boring? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is a standard bore piston sized at 66.40 mm, so it installs into a stock-dimension cylinder without machining.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is included in the kit? \u003cstrong\u003eA:\u003c\/strong\u003e The kit ships with the piston, ring set, wrist pin, and circlips, though you should verify the exact contents against your service manual before assembly.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":51139956867158,"sku":"OO1C22352","price":340.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_81fea937-6f35-41e0-a306-50d9058a8dfa.jpg?v=1794565735","url":"https:\/\/www.solidspare.com\/products\/804m06640-wiseco-std-piston-kit-for-yamaha-yz250x-2016-2024-66-40-mm","provider":"Solid Spare","version":"1.0","type":"link"}