{"product_id":"4069m07450-wiseco-3-mm-piston-kit-for-yamaha-xs1100-1978-1981-74-50mm-10-25-1","title":"4069M07450 Wiseco +3 mm Piston Kit for Yamaha XS1100 1978-1981 74.50mm 10.25:1","description":"\u003ch2\u003eWiseco +3 mm Piston Kit for Yamaha XS1100\u003c\/h2\u003e\u003cp\u003eThis Wiseco +3 mm piston kit for Yamaha XS1100 models is a 74.50mm, 10.25:1 compression piston (cross-reference 4069M07450) built for big-bore top-end builds on 1978-1981 machines.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco piston kit for Yamaha XS1100 motorcycles is a 74.50mm, +3 mm oversize piston made for bored-out cylinders and performance rebuilds. The 10.25:1 compression ratio piston kit for Yamaha XS1100 supports strong midrange pull on a classic inline four. It suits builders and shops doing a big-bore top-end job on 1978-1981 models.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e74.50mm bore size, +3 mm oversize over stock\u003c\/li\u003e\n\u003cli\u003e10.25:1 compression ratio for strong midrange output\u003c\/li\u003e\n\u003cli\u003eWiseco forged piston construction for durability at higher rpm\u003c\/li\u003e\n\u003cli\u003eCross-reference 4069M07450 for easy parts matching\u003c\/li\u003e\n\u003cli\u003eIntended for use with a matching overbored cylinder\u003c\/li\u003e\n\u003cli\u003eDesigned as a direct-fit piston for the XS1100 top end\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha XS1100, 1978-1981\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBig-bore rebuilds on classic XS1100 inline fours\u003c\/li\u003e\n\u003cli\u003eRestoring compression on worn or scored cylinders\u003c\/li\u003e\n\u003cli\u003eShop engine builds requiring an oversize piston\u003c\/li\u003e\n\u003cli\u003eStreet and touring use where midrange torque matters\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\u003e4069M07450\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e74.50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+3 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\u003eMachine Fitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Yamaha XS1100, 1978-1981\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 Can this piston drop into a stock XS1100 cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e No, a +3 mm oversize piston requires the cylinder to be bored and honed to the matching 74.50mm size. Have the machine work done by a qualified shop before assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need to rejet the carbs after fitting this kit? \u003cstrong\u003eA:\u003c\/strong\u003e Higher compression and displacement often change fueling needs, so carburetor jetting should be checked and adjusted as required. Confirm clearances and ring end gaps against Wiseco specifications for your build.\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":51140006314070,"sku":"OO1C22411","price":435.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_f60a96f7-d3b0-4b0d-bd2f-85cb88fb2bc7.jpg?v=1794565857","url":"https:\/\/www.solidspare.com\/products\/4069m07450-wiseco-3-mm-piston-kit-for-yamaha-xs1100-1978-1981-74-50mm-10-25-1","provider":"Solid Spare","version":"1.0","type":"link"}