Vertex WR101-081 Engine Rebuild Kit – Yamaha YZ125 / YZ125X (2005–2022)
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Vertex Complete Engine Rebuild Kit – Yamaha YZ125 / YZ125X (2005–2022) (WR101-081 / 0903-1016)
Description
Get your YZ125 or YZ125X back to full race-ready power with the Vertex WR101-081 Complete Engine Rebuild Kit (0903-1016). Designed by Wrench Rabbit, this all-in-one rebuild kit combines Vertex, Hot Rods, and Cometic-quality components to restore compression, smooth crank operation, and factory-level reliability.
Whether you’re refreshing your top and bottom end for racing, trails, or MX training, this kit provides everything you need for a professional-grade rebuild in one box—no extra sourcing required.
What’s Included
✅ Hot Rods heavy-duty crankshaft (stock stroke with wrist pin bearing)
✅ Vertex standard compression piston kit (piston, rings, pin & clips)
✅ Complete engine gasket kit (top & bottom ends)
✅ Oil seal kit
✅ Main bearing & seal kit
✅ Transmission bearing kit (includes output shaft collar and sprocket lock washer)
✅ Counter balancer bearing kit
✅ Water pump bearing & seal kit
✅ Countershaft seal kit
✅ Wrist pin bearing
Fitment
📦 Fits:
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2005–2021 Yamaha YZ125
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2020–2022 Yamaha YZ125X
(Fits stock-stroke 125cc 2-stroke Yamaha engines. Direct OEM replacement—no case mods required.)
Key Features
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One-box complete engine rebuild for YZ125 / YZ125X (2005–2022)
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Genuine Vertex and Hot Rods parts ensure OEM fitment
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Restores compression, oil sealing, and crank alignment
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Ideal for full engine restorations, race prep, or high-hour rebuilds
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Designed for precision balance and long-term durability
Warranty Info
Manufactured by Vertex / Wrench Rabbit.
Warranty and tech support available directly from the manufacturer.
Price & SKU
💲 Retail Price: $682.95
SKU: WR101-081 / 0903-1016
Estimated Shipping Weight: 10.3 lb
Handling: Ships next business day
📦 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.
