Wrench Rabbit Yamaha YZ125 2005-2016 Complete Engine Rebuild Kit WR101-081

When your Yamaha YZ125 engine shows signs of wear—whether it's lost compression, increased blow-by, or declining power delivery—a complete rebuild is the most cost-effective path to restoring full performance. The Wrench Rabbit WR101-081 kit consolidates every critical component you'll need into one package, eliminating the guesswork of sourcing individual parts and ensuring compatibility across your entire bottom and top end. This is the rebuild solution trusted by mechanics and enthusiasts who refuse to compromise on engine longevity.

The kit pairs a Vertex piston assembly with a Hot Rods heavy-duty crankshaft, both engineered to handle the demands of two-stroke racing. Complete bearing kits for the main, transmission, counter balancer, and water pump—along with a full Vertex gasket and seal kit—mean you can approach this rebuild with confidence, knowing every wear surface and sealing point has been addressed.

• Vertex standard compression piston
• Piston rings and wrist pin
• Hot Rods stock stroke crank
• Included wrist pin bearing
• Main bearing and seal kit
• Transmission bearing kit
• Counter balancer bearing kit
• Water pump bearing kit
• Complete gasket and seal set
• Fits Yamaha YZ125 2005–2016
• Bolt-on installation recommended
• Professional rebuild best practice