{"product_id":"hot-rods-4054-crankshaft-assembly-yamaha-yz125-moto-house-mx","title":"Hot Rods Crankshaft Assembly 4054 — Yamaha YZ125 \/ YZ125X 2005-2022","description":"\u003ch1\u003e\u003cstrong\u003eHot Rods Crankshaft Assembly 4054 — Yamaha YZ125 \/ YZ125X 2005-2022\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eGet your Yamaha 125cc 2-stroke back on the track with the \u003cstrong\u003eHot Rods 4054 Crankshaft Assembly\u003c\/strong\u003e. Designed for the YZ125 and YZ125X, this high-performance assembly takes the complexity out of engine building by arriving complete, pre-assembled, and factory-trued to precise OEM specifications.\u003c\/p\u003e\n\u003cp\u003eForged from premium \u003cstrong\u003e4140 steel\u003c\/strong\u003e, this crankshaft is engineered to provide superior strength and durability compared to standard components. The assembly includes proven Hot Rods connecting rods and top-end bearings, with precision-machined gears rated at DIN class 9 or higher. For long-term peace of mind, the entire unit is completely rebuildable using genuine Hot Rods components, making it an essential choice for any serious 125 engine overhaul.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Hot Rods Crankshaft Assembly\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSold complete with proven Hot Rods connecting rods and top-end bearings\u003c\/li\u003e\n\u003cli\u003eFactory assembled and trued to meet or exceed OEM performance specifications\u003c\/li\u003e\n\u003cli\u003eManufactured from durable 4140 steel for extreme 2-stroke reliability\u003c\/li\u003e\n\u003cli\u003eGears precision-machined to DIN class 9 quality level or higher\u003c\/li\u003e\n\u003cli\u003eComplete, pre-balanced, and ready for immediate installation\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;\"\u003e2005-2021\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;\"\u003eYZ125\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;\"\u003e2020-2022\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;\"\u003eYZ125X\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: Does this kit save me time at the machine shop?\u003c\/strong\u003e\u003cbr\u003eA: Absolutely. Because it is already pressed and trued to OEM specs, you can drop this assembly directly into your cases, saving you the cost and delay of professional crankshaft machine work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this assembly stronger than my stock crankshaft?\u003c\/strong\u003e\u003cbr\u003eA: Hot Rods crankshafts are designed to meet or exceed OEM specifications, often providing better material quality and heat-treatment processes that result in improved durability for high-revving 125cc engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e When installing a new crankshaft, ensure your main bearing seats are perfectly clean. Even a microscopic spec of dirt can cause the bearing to sit slightly misaligned, which will lead to premature crank failure and unwanted vibration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-2-stroke-dirt-bikes-performance-parts-accessories-moto-house-mx\"\u003eYamaha 2-Stroke Performance Parts\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz125-performance-upgrades-engine-mods-and-accessories-moto-house-mx\"\u003eYamaha YZ125 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, Crank Seals, \u0026amp; Chemicals\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":"Hot Rods","offers":[{"title":"Default Title","offer_id":40562245173331,"sku":"4054","price":402.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/hot-rods-oem-replacement-crankshaft-4054-2005-2020-yamaha-yz125-356439.jpg?v=1735344478","url":"https:\/\/motohousemx.com\/products\/hot-rods-4054-crankshaft-assembly-yamaha-yz125-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}