{"product_id":"vertex-vtk22520b-top-end-piston-kit-yamaha-yz125-1998-2000-moto-house-mx","title":"Vertex Top End Piston Kit VTK22520B (53.94mm) — Yamaha YZ125 1998-2000","description":"\u003ch1\u003e\u003cstrong\u003eVertex Top End Piston Kit VTK22520B — Yamaha YZ125 1998-2000 (53.94mm)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eRefresh your Yamaha YZ125 top end with the complete Vertex VTK22520B Top End Piston Kit. Designed for 1998–2000 models, this all-in-one kit simplifies your maintenance process by bundling a high-quality cast replica piston with all the necessary top-end gaskets and the essential wrist pin bearing.\u003c\/p\u003e\n\u003cp\u003eVertex cast pistons are crafted from an 18% silicone-content gravity-cast aluminum alloy, providing superior dimensional stability under the high heat of 2-stroke engine operation. The Molybdenum Disulphite (MoS2) skirt coating minimizes friction, accelerates break-in, and provides lasting protection against scuffing. With this comprehensive kit, you can be confident that you have everything required to restore factory compression and throttle response.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Vertex Top End Piston Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-in-One Solution:\u003c\/strong\u003e Includes piston, rings, wrist pin, circlips, top-end gaskets, and a wrist pin bearing for a complete refresh.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Precision:\u003c\/strong\u003e Designed as a direct cast OE replacement piston for exact compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Material:\u003c\/strong\u003e Gravity-cast aluminum alloy with 18% silicone stabilizes the piston shape under extreme temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoly-Coated Skirt:\u003c\/strong\u003e Coated with Molybdenum Disulphite for reduced friction, quicker break-in, and added protection against scuffing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-5 Heat Treated:\u003c\/strong\u003e Undergoes a complete T-5 hardening and tempering cycle to maximize structural integrity and lifespan.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease confirm your cylinder bore size before ordering to ensure the correct piston fitment.\u003c\/p\u003e\n\u003ch3\u003eProduct Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Diameter:\u003c\/strong\u003e 53.94 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Diameter:\u003c\/strong\u003e 54.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 125 cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e 2-Stroke\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ddd; font-family: sans-serif;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f4f4f4; text-align: left;\"\u003e\n\u003cth style=\"padding: 12px; border: 1px solid #ddd;\"\u003eYear Range\u003c\/th\u003e\n\u003cth style=\"padding: 12px; border: 1px solid #ddd;\"\u003eVehicle Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003e1998-2000\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #ddd;\"\u003eYamaha YZ125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of including the wrist pin bearing in the kit?\u003c\/strong\u003e\u003cbr\u003eA: The wrist pin bearing is a high-wear component that endures immense loads. Replacing it with every piston change prevents premature failure that could otherwise destroy your new piston and cylinder. Including it ensures a safe, reliable rebuild.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e Before installing your new rings, always check the ring end gap in the cylinder to ensure it falls within the manufacturer's specified range. This ensures optimal compression and prevents the rings from binding as the engine heats up.\u003c\/p\u003e\n\u003ch3\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eEssential Off-Road Motorcycle Tools\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003eHigh-Performance Premix \u0026amp; Gear Oils\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\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 machines. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMoto-House MX – Choice of Champions – Clermont \/ Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"VERTEX","offers":[{"title":"Default Title","offer_id":42705406361683,"sku":"VTK22520B","price":188.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/vertex-vtk22520b-piston-top-end-kit-5394mm-19982000-yamaha-yz125-285846.png?v=1748066439","url":"https:\/\/motohousemx.com\/products\/vertex-vtk22520b-top-end-piston-kit-yamaha-yz125-1998-2000-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}