{"product_id":"4069m07400-wiseco-2-50-mm-piston-for-yamaha-xs1100-1978-1981-74mm-10-25-1-cr","title":"4069M07400 Wiseco +2.50 mm Piston for Yamaha XS1100 1978-1981 74mm 10.25:1 CR","description":"\u003ch2\u003eWiseco +2.50 mm Piston for Yamaha XS1100\u003c\/h2\u003e\u003cp\u003eThis Wiseco +2.50 mm piston, part 4069M07400, measures 74mm and delivers a 10.25:1 compression ratio for Yamaha XS1100 engines, restoring or increasing displacement with a forged replacement that handles high cylinder pressures.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco +2.50 mm piston is a forged replacement component built for Yamaha XS1100 engines running 1978-1981 models. The 74mm bore and 10.25:1 compression ratio make this Wiseco piston a solid choice for riders rebuilding a worn top end or refreshing a performance-oriented engine build. It suits mechanics and enthusiasts who want a reliable piston that holds up under the demands of a classic inline four.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged aluminum construction for higher strength than cast pistons\u003c\/li\u003e\n\u003cli\u003e74mm bore size matches a +2.50 mm overbore for worn cylinders\u003c\/li\u003e\n\u003cli\u003e10.25:1 compression ratio supports strong combustion efficiency\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves for consistent ring seal\u003c\/li\u003e\n\u003cli\u003ePart number 4069M07400 for straightforward cross-referencing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha XS1100 1978\u003c\/li\u003e\n\u003cli\u003efor Yamaha XS1100 1979\u003c\/li\u003e\n\u003cli\u003efor Yamaha XS1100 1980\u003c\/li\u003e\n\u003cli\u003efor Yamaha XS1100 1981\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on high-mileage XS1100 engines\u003c\/li\u003e\n\u003cli\u003eCylinder overbore work when bores are scored or out of spec\u003c\/li\u003e\n\u003cli\u003eRestoration projects returning a classic inline four to service\u003c\/li\u003e\n\u003cli\u003ePerformance builds seeking a higher compression ratio\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\u003e4069M07400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e74mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+2.50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.25:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged\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 piston require machine work on the cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, a +2.50 mm overbore piston needs the cylinder bored and honed to match the 74mm size before installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I install just one piston? \u003cstrong\u003eA:\u003c\/strong\u003e It can be installed individually, though replacing pistons as a matched set is common practice on multi-cylinder engines during a rebuild.\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":51140006445142,"sku":"OO1C22412","price":435.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_7aee2abd-90d2-4371-a1f2-ea96c9ecedab.jpg?v=1794565855","url":"https:\/\/www.solidspare.com\/products\/4069m07400-wiseco-2-50-mm-piston-for-yamaha-xs1100-1978-1981-74mm-10-25-1-cr","provider":"Solid Spare","version":"1.0","type":"link"}