Yamaha YZ125 / YZ125X Athena Stock Bore Cylinder Kit (2005–2022)
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
-
Athena 54mm OEM Stock Bore Nikasil Cylinder (125cc)
-
Athena Cast-Lite Flat Top Piston Kit (piston, rings, wrist pin, circlips)
-
Athena Complete Top End Gasket Set (all seals and hardware)
-
Athena Cylinder Head w/ Removable Bronze Dome (anti-detonation, high-compression design)
-
Athena High-Performance Hard Anodized Power Valves (OEM valves not compatible)
-
All brand-new parts backed by Athena warranty
📦 Fitment
-
Yamaha YZ125 (2005–2021)
-
Yamaha YZ125X (2020–2022)
🛡️ Warranty Info
-
Backed by Athena’s manufacturer warranty
-
Professional installation is strongly recommended
-
Warranty does not cover failures from improper installation, tuning errors, or incorrect break-in
🔑 Key Features
-
Stock bore 54mm (125cc) for OEM-style rebuilds
-
Aluminum cylinder with nickel-carbide plating & enlarged water jackets for cooling
-
Includes Athena high-performance anodized power valves (not OEM compatible)
-
Cylinder head with removable bronze dome for compression tuning & anti-detonation
-
Complete bolt-on solution, no machining required (unless otherwise noted)
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.