{"product_id":"wiseco-wpc134-crankshaft-kit-yamaha-yz250-yz250x-moto-house-mx","title":"Wiseco Crankshaft Kit WPC134 — Yamaha YZ250 \/ YZ250X 2003-2025","description":"\u003ch1\u003e\u003cstrong\u003eWiseco Crankshaft Kit WPC134 — Yamaha YZ250 YZ250X 2003-2025\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eRestore your engine to factory-fresh reliability with the \u003cstrong\u003eWiseco Crankshaft Kit WPC134\u003c\/strong\u003e. This comprehensive bottom-end solution takes the guesswork out of engine building by providing a factory-assembled, precision-trued crankshaft that meets or exceeds OEM specifications. Each kit includes the crankshaft assembly, high-quality main bearings, and a complete bottom-end gasket set, ensuring you have everything you need for a professional-grade rebuild.\u003c\/p\u003e\n\u003cp\u003eWiseco’s engineering expertise shines through in the \u003cstrong\u003edouble-forged connecting rod\u003c\/strong\u003e, which offers superior dimensional consistency and improved grain flow. The rod is shot-peened to eliminate residual stress and features precision-engineered oiling slots to maximize bearing life. With double-drilled small ends to provide extra lubrication to the piston pin, this crankshaft is designed to run cooler, last longer, and handle the high-performance demands of both motocross and off-road riding.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Wiseco Crankshaft Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFactory-assembled and precision-trued crankshaft ready for installation.\u003c\/li\u003e\n\u003cli\u003eDouble-forged connecting rod provides superior strength and grain flow consistency.\u003c\/li\u003e\n\u003cli\u003ePrecision-honed bearing surfaces and shot-peened rod for stress relief.\u003c\/li\u003e\n\u003cli\u003eDouble-drilled small ends optimize lubrication and cooling for the piston pin.\u003c\/li\u003e\n\u003cli\u003eComplete kit includes crankshaft assembly, main bearings, and bottom-end gaskets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eFitment List\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e0e0e0; margin-top: 15px; margin-bottom: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f7f7f7;\"\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eYear Range\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Brand\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2016-2025\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYZ250X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2003-2025\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYZ250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this kit balanced for high-RPM racing?\u003c\/strong\u003e\u003cbr\u003eA: Yes, Wiseco crankshafts are factory trued and balanced to OEM specifications, which is sufficient for almost all racing applications. If you are building a custom high-compression big-bore engine, professional balancing may be an optional consideration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the gasket kit include top-end gaskets?\u003c\/strong\u003e\u003cbr\u003eA: No, this is a bottom-end kit. You will need to purchase a separate top-end gasket or rebuild kit to complete the top half of your engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e When installing a new crankshaft, cleanliness is paramount. Ensure your engine cases are completely free of old gasket material and debris. Always use a proper crankshaft installation tool to pull the crank into the cases; never hammer the crankshaft into place, as even a slight misalignment can drastically shorten the life of your new bearings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250-and-yz250x-performance-parts-collection-at-moto-house-mx\"\u003eYamaha YZ250 \/ YZ250X Performance Parts\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003eAssembly Lube \u0026amp; Premium Chemicals\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eEssential Engine Rebuild Tools\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eAt Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMoto-House MX – Choice of Champions\u003c\/strong\u003e – Clermont \/ Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":39644604399699,"sku":"WPC134","price":420.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/wiseco-oem-replacement-bottom-end-kit-wpc134-yamaha-yz250-2003-2023-101701.jpg?v=1738049751","url":"https:\/\/motohousemx.com\/products\/wiseco-wpc134-crankshaft-kit-yamaha-yz250-yz250x-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}