Yamaha YZ125 / YZ125X Athena Stock Bore Cylinder Kit (2005–2022)
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Yamaha YZ125 / YZ125X 54mm Athena Stock Bore Cylinder Top End Rebuild Kit (2005–2022)
🛠️ Description
Bring your Yamaha YZ125 back to life with this complete Athena Stock Bore Cylinder Kit. Designed for 2005–2021 YZ125 and 2020–2022 YZ125X, this 54mm OEM-spec top end rebuild kit restores power, improves cooling efficiency, and includes everything you need for a professional-level refresh. Engineered with premium materials and precision machining, this is the most complete OEM-style solution available.
✅ What’s Included
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Athena 54mm OEM Stock Bore Nikasil Cylinder (125cc)
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Athena Cast-Lite Flat Top Piston Kit (piston, rings, wrist pin, circlips)
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Athena Complete Top End Gasket Set (all seals and hardware)
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Athena Cylinder Head w/ Removable Bronze Dome (anti-detonation, high-compression design)
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Athena High-Performance Hard Anodized Power Valves (OEM valves not compatible)
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All brand-new parts backed by Athena warranty
📦 Fitment
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Yamaha YZ125 (2005–2021)
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Yamaha YZ125X (2020–2022)
🛡️ Warranty Info
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Backed by Athena’s manufacturer warranty
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Professional installation is strongly recommended
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Warranty does not cover failures from improper installation, tuning errors, or incorrect break-in
🔑 Key Features
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Stock bore 54mm (125cc) for OEM-style rebuilds
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Aluminum cylinder with nickel-carbide plating & enlarged water jackets for cooling
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Includes Athena high-performance anodized power valves (not OEM compatible)
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Cylinder head with removable bronze dome for compression tuning & anti-detonation
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Complete bolt-on solution, no machining required (unless otherwise noted)
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
