Would a yz125 fit me I am 55 170 pounds?

A Yamaha YZ125 could be a good fit for you at 5'5" and 170 pounds. The bike's lightweight design and agile handling make it suitable for riders of various sizes, and its power delivery is manageable for most skill levels. However, it's important to test ride the bike to ensure you feel comfortable with its seat height and overall maneuverability. Additionally, consider your riding experience and preferences when making a decision.