{"product_id":"wiseco-91-00-mm-pk1591-4-stroke-forged-series-piston-kit","title":"Wiseco 91.00 mm PK1591 4-Stroke Forged Series Piston Kit","description":"Premium materials produce the best sealing technology available exceeding O.E.M. standards.  2-Stroke: Wiseco top end gasket kit; Dedicated forging; Superior strength\/weight ratio utilizing Aerospace alloy; Race-proven designs; Chosen by top race teams, in all forms of racing; CNC machined; Optimal cam shape and profile for peak HP and service life; Premium top end needle bearing; Precision-machined, highest-quality materials for strength and reduced friction; High-performance ring set; Extended life and sustained power; Highest-quality alloy pin; Consistently true and durable.  4-Stroke: Wiseco top end gasket kit; Premium materials produce the best sealing technology available, exceeding O.E.M. standards; Dedicated forging; Superior strength\/weight ratio utilizing Aerospace alloy; Dome design; Improved flame travel; Chrome plated piston pin; Horizontal slot pin oiling; Reduced friction\/scuff resistant; Pressure seal groove; Maximum ring seal; Armor Glide Skirt-Coated available for select models; Dedicated Rings; Maximum compression and oil control.\nWiseco 4 Stroke Forged Series Piston Kit, 91.00 mm Bore, 9.5:1 CR\n\u003cul\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 4-stroke powersports engine\u003c\/li\u003e\n  \u003cli\u003eDedicated forgings allow for optimized strength-to-weight ratio\u003c\/li\u003e\n  \u003cli\u003eIncludes high-quality piston rings, 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 PK1591 4-Stroke Forged Series Piston Kit features a 91.00 mm bore and a 9.5:1 compression ratio. It is designed and built for specific 4-stroke powersports engines, with a dedicated forging that optimizes the strength-to-weight ratio. Improved tensile strength helps support service life and performance.\u003c\/p\u003e\u003cp\u003eThis piston kit includes high-quality piston rings, wrist pin(s), and circlips. Additional design features include a dome design for improved flame travel, a chrome-plated piston pin, horizontal slot pin oiling, reduced friction, a scuff-resistant surface, a pressure seal groove, and dedicated rings for compression and oil control. Wiseco states that the piston is engineered, forged, and machined in the USA in Mentor, Ohio.\u003c\/p\u003e\u003cp\u003eFitment includes 1998–2002 Honda TRX450FE FourTrax Foreman ES and 1998–2002 Honda TRX450FM FourTrax Foreman S models. Manufacturer part number: PK1591. Vendor part number: 4825M.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e91.00 mm bore and 9.5:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eForged 4-stroke piston designed for specific powersports engines\u003c\/li\u003e\n\u003cli\u003eDedicated forging optimizes the strength-to-weight ratio\u003c\/li\u003e\n\u003cli\u003eImproved tensile strength supports performance and service life\u003c\/li\u003e\n\u003cli\u003eIncludes high-quality piston rings, wrist pin(s), and circlips\u003c\/li\u003e\n\u003cli\u003eDome design improves flame travel\u003c\/li\u003e\n\u003cli\u003eChrome-plated piston pin with horizontal slot pin oiling\u003c\/li\u003e\n\u003cli\u003ePressure seal groove and dedicated rings support compression and oil control\u003c\/li\u003e\n\u003cli\u003eEngineered, forged, and machined in the USA in Mentor, Ohio\u003c\/li\u003e\n\u003cli\u003eFits 1998–2002 Honda TRX450FE FourTrax Foreman ES and TRX450FM FourTrax Foreman S models\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\nRegular Stock: false\u003cbr\u003e\nClearance Item: t\u003cbr\u003e\nUnits Per Sku: 1\u003cbr\u003e\nFitment:\u003cbr\u003e\n1998 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n1998 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n1999 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n1999 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2000 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n2000 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2001 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n2001 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2002 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n2002 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2003 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n2003 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2004 Honda TRX450FE FourTrax Foreman ES Base\u003cbr\u003e\n2004 Honda TRX450FM FourTrax Foreman S Base\u003cbr\u003e\n2004 Honda TRX450R Base","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":68300486246635,"sku":"589556","price":246.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/a76f34294f678d4fd5658e8f46cc3edd_074c7ef1-9f54-4883-b69c-3495827f02aa.jpg?v=1793226657","url":"https:\/\/ctracingservices.com\/products\/wiseco-91-00-mm-pk1591-4-stroke-forged-series-piston-kit","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}