{"product_id":"wiseco-81-00-mm-639m08100-piston","title":"Wiseco 81.00 mm 639M08100 Piston","description":"Classic Forged 2-stroke pistons are perfect for those looking to rebuild their 2-stroke engine with reliable, high-quality components. These pistons cover a wide range of Powersports rebuilds, including vintage motocross models, classic street bikes, and snowmobiles. The forged material improves tensile strength over cast pistons, ensuring refreshed performance on the track or the trail.\n81.00 mm Bore\n\u003cul\u003e\n  \u003cli\u003eDedicated forgings and additional lightening operations allow for optimized strength-to-weight ratio\u003c\/li\u003e\n  \u003cli\u003eImproved tensile strength of forged material optimizes strength and service life\u003c\/li\u003e\n  \u003cli\u003eDesigned and built for each specific 2-stroke powersports engine\u003c\/li\u003e\n  \u003cli\u003eIncludes high-quality piston ring(s), wrist pin(s), and circlips\u003c\/li\u003e\n  \u003cli\u003eEngineered, forged, and machined in the USA in Mentor, OH\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Wiseco Classic Forged 2-Stroke Piston is designed for rebuilding compatible powersports engines. This piston features an 81.00 mm bore and is engineered for specific 2-stroke applications, including the listed Polaris Trail Boss 350L models. Its forged construction provides improved tensile strength compared with cast pistons, supporting service life and refreshed engine performance.\u003c\/p\u003e\u003cp\u003eDedicated forgings and additional lightening operations help optimize the piston’s strength-to-weight ratio. The piston includes high-quality piston ring(s), wrist pin(s), and circlips. It is engineered, forged, and machined in the USA in Mentor, Ohio.\u003c\/p\u003e\u003cp\u003eFitment includes the 1990–1993 Polaris Trail Boss 350L 2X4 and 4X4. Manufacturer part number: 639M08100. Vendor part number: 639M08100. Verify engine application and installation requirements before purchase.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBore: 81.00 mm\u003c\/li\u003e\n\u003cli\u003eConstruction: Forged material with improved tensile strength compared with cast pistons\u003c\/li\u003e\n\u003cli\u003eStrength-to-weight ratio: Dedicated forgings and additional lightening operations\u003c\/li\u003e\n\u003cli\u003eApplication: Designed and built for specific 2-stroke powersports engines\u003c\/li\u003e\n\u003cli\u003eIncluded components: Piston ring(s), wrist pin(s), and circlips\u003c\/li\u003e\n\u003cli\u003eManufacturing: Engineered, forged, and machined in the USA in Mentor, Ohio\u003c\/li\u003e\n\u003cli\u003eFitment: 1990–1993 Polaris Trail Boss 350L 2X4 and 4X4\u003c\/li\u003e\n\u003cli\u003eBrand: Wiseco\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: 639M08100\u003c\/li\u003e\n\u003cli\u003eVendor part number: 639M08100\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cbr\u003e\n\u003cbr\u003e\nAir Freight Prohibited: false\u003cbr\u003e\nNot Carb Approved: true\u003cbr\u003e\nCarb Acknowledgement Required: true\u003cbr\u003e\nLtl Freight Required: false\u003cbr\u003e\nProp 65: Y\u003cbr\u003e\nPart Type: powersports\u003cbr\u003e\nEpa: N\/A\u003cbr\u003e\nClearance Item: t\u003cbr\u003e\nRegular Stock: false\u003cbr\u003e\nUnits Per Sku: 1\u003cbr\u003e\nFitment:\u003cbr\u003e\n1990 Polaris Trail Boss 350L 2X4 Base\u003cbr\u003e\n1990 Polaris Trail Boss 350L 4X4 Base\u003cbr\u003e\n1991 Polaris Trail Boss 350L 2X4 Base\u003cbr\u003e\n1991 Polaris Trail Boss 350L 4X4 Base\u003cbr\u003e\n1992 Polaris Trail Boss 350L 2X4 Base\u003cbr\u003e\n1992 Polaris Trail Boss 350L 4X4 Base\u003cbr\u003e\n1993 Polaris Trail Boss 350L 2X4 Base\u003cbr\u003e\n1993 Polaris Trail Boss 350L 4X4 Base","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":68300488474859,"sku":"589633","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/a76f34294f678d4fd5658e8f46cc3edd_0a0f354c-3b10-4a47-bb84-da28ff9e1cd5.jpg?v=1793226748","url":"https:\/\/ctracingservices.com\/products\/wiseco-81-00-mm-639m08100-piston","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}