{"product_id":"4689m07450-wiseco-060-piston-kit-74-50-mm-10-5-1-for-yamaha-ttr250-1999-2006","title":"4689M07450 Wiseco .060 Piston Kit 74.50 mm 10.5:1 for Yamaha TTR250 1999-2006","description":"\u003ch2\u003ePiston Kit for Yamaha TTR250\u003c\/h2\u003e\u003cp\u003eThis Wiseco .060 overbore piston kit, part number 4689M07450, measures 74.50 mm and delivers a 10.5:1 compression ratio, giving your Yamaha TTR250 top end a complete rebuild solution.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco piston kit is a .060 overbore replacement for the Yamaha TTR250, supplying a 74.50 mm forged piston with a 10.5:1 compression ratio. It is made for riders doing a top-end rebuild or a bore-out after cylinder wear, and it pairs with the corresponding overbore gasket set. This piston kit for Yamaha TTR250 restores compression and reliable running for trail and off-road riding.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged piston construction for added strength under load\u003c\/li\u003e\n\u003cli\u003e74.50 mm bore size, .060 inch over stock\u003c\/li\u003e\n\u003cli\u003e10.5:1 compression ratio for strong combustion pressure\u003c\/li\u003e\n\u003cli\u003eWiseco part number 4689M07450 for precise cross-referencing\u003c\/li\u003e\n\u003cli\u003eIncludes piston, rings, wrist pin, and circlips as supplied\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha TTR250 1999\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2000\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2001\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2002\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2003\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2004\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2005\u003c\/li\u003e\n\u003cli\u003efor Yamaha TTR250 2006\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds after piston or ring wear\u003c\/li\u003e\n\u003cli\u003eCylinder overbore service and honing projects\u003c\/li\u003e\n\u003cli\u003eTrail and enduro riding where compression matters\u003c\/li\u003e\n\u003cli\u003eRestoring a tired Yamaha TTR250 engine\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\u003e4689M07450\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e74.50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.060 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.5:1\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\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 Yes, a .060 overbore piston needs the cylinder machined to 74.50 mm before installation. Always check piston-to-wall clearance during assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will I need new gaskets? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, fit a matching overbore top-end gasket set when you install this piston kit. Reusing old gaskets can cause leaks or compression loss.\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":51140105961558,"sku":"OO1C22558","price":483.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_730b807e-a1e6-473b-8be6-210b8b2b1207.jpg?v=1794565955","url":"https:\/\/www.solidspare.com\/products\/4689m07450-wiseco-060-piston-kit-74-50-mm-10-5-1-for-yamaha-ttr250-1999-2006","provider":"Solid Spare","version":"1.0","type":"link"}