Yamaha YZ125 Buyer’s Guide

Shopping for a new bike? Here’s what you need to know.

Yamaha YZ125

The Yamaha YZ125 is a two-stroke motocross bike that has been a popular choice for riders of all skill levels for over 20 years. This dirt bike has a lightweight frame, high-performance engine, and excellent handling that makes it perfect for racing or just riding off-road. The YZ125 has been refined over the years and is now one of the best motocross bikes in its class. This buyer’s guide will provide you with all the information you need to know about the Yamaha YZ125, including its powertrain, handling, brakes, electronics, warranty, and updates for 2023.


The Yamaha YZ125 is powered by a liquid-cooled, two-stroke, single-cylinder engine that produces 35 horsepower. This engine is mated to a six-speed transmission that allows for quick and smooth gear changes. The YZ125 also features Yamaha’s Power Valve System (YPVS), which improves low-end torque and mid-range power delivery. This system uses a servo motor to adjust the exhaust port height, optimizing power delivery for different riding conditions.


The Yamaha YZ125 has a lightweight aluminum frame that provides excellent handling and maneuverability. The bike’s suspension system consists of a KYB inverted fork and a KYB shock absorber, both of which are fully adjustable to suit different riding styles and terrain. The YZ125 also features a 270mm front disc brake and a 240mm rear disc brake, which provide excellent stopping power.


The Yamaha YZ125 does not come with any electronic rider aids, as it is a pure motocross bike designed for racing and off-road riding. However, the bike does feature a digital CDI ignition system, which provides reliable ignition timing and ensures smooth power delivery.


The Yamaha YZ125 comes with a one-year limited factory warranty that covers defects in materials and workmanship. This warranty can be extended for an additional cost.


$8,299.00 – $8,499.00

Updates for 2023:

The Yamaha YZ125 has not yet been updated for the 2023 model year. However, Yamaha is known for making regular updates to its motocross bikes, so it is possible that the YZ125 could receive some changes for 2023.

Yamaha YZ125 Specs:

  • Engine: Liquid-cooled, two-stroke, single-cylinder
  • Displacement: 125cc
  • Bore x Stroke: 54.0mm x 54.5mm
  • Compression Ratio: 8.6:1
  • Transmission: Six-speed
  • Suspension: KYB inverted fork (adjustable), KYB shock absorber (adjustable)
  • Front Brake: 270mm disc
  • Rear Brake: 240mm disc
  • Wheelbase: 56.8 inches
  • Seat Height: 38.4 inches
  • Fuel Capacity: 2.1 gallons
  • Weight: 207 pounds (wet)


  • Lightweight and maneuverable
  • High-performance engine with Yamaha’s Power Valve System
  • Fully adjustable suspension
  • Excellent handling and braking
  • One-year limited factory warranty


  • Two-stroke engine may require more maintenance than a four-stroke engine
  • No electronic rider aids
  • Tall seat height may be challenging for shorter riders
  • Limited fuel capacity