Vertex Engine Rebuild Kit for Yamaha YZ125/X (WR101-081)

The Vertex Engine Rebuild Kit WR101-081 is a convenient one-stop solution for rebuilding compatible Yamaha YZ125 and YZ125X engines. Designed for professional-quality service, this comprehensive kit combines the major internal engine components and sealing hardware needed to restore dependable performance while helping simplify parts selection and installation planning.
The kit includes a Vertex standard-compression piston with piston rings, wrist pin, and retaining clips. It also features a Hot Rods heavy-duty crankshaft with stock stroke and wrist pin bearing, providing a durable foundation for the rebuilt bottom end. Hot Rods main bearing and seal components are included to support proper crankshaft operation and help protect critical internal surfaces from contamination and leakage.
Additional drivetrain and engine service components are supplied for a more complete rebuild. The Hot Rods transmission bearing kit includes transmission bearings, an output shaft collar, and a sprocket lock washer. A Hot Rods counter balancer bearing kit, along with a Hot Rods water pump bearing and seal kit, supports reliable operation across key engine systems. The Vertex complete gasket kit includes seals and an O-ring kit covering both the top and bottom ends.
Built for compatible Yamaha YZ125/X applications, the Vertex WR101-081 kit brings together matched components from Vertex and Hot Rods for an efficient engine overhaul. Verify model year and application compatibility before installation, and follow the motorcycle manufacturer’s service procedures and torque specifications during assembly.

Features:

• Complete rebuild package: Combines major top-end, bottom-end, transmission, counter balancer, water pump, bearing, seal, and gasket components

• Vertex piston assembly: Includes a standard-compression piston, piston rings, wrist pin, and retaining clips

• Hot Rods heavy-duty crankshaft: Stock-stroke crank includes a wrist pin bearing

• Main bearing and seal kit: Supports crankshaft service and helps maintain proper engine sealing

• Transmission bearing kit: Includes transmission bearings, output shaft collar, and sprocket lock washer

• Counter balancer service kit: Includes components for counter balancer bearing replacement

• Water pump bearing and seal kit: Provides key components for water pump servicing

• Complete gasket coverage: Includes top- and bottom-end gaskets, seals, and O-rings

• Application: Designed for compatible Yamaha YZ125 and YZ125X motorcycles

Ships from Parts Unlimited.