I Tested the Stihl FS90R Spark Plug: My Honest Guide to Better Performance
When I first started working with the Stihl FS90R, I quickly realized how much of its performance depends on a small but essential part: the spark plug. It’s easy to overlook, but this component plays a major role in how smoothly the trimmer starts, runs, and delivers power when I need it most. Whether I’m…
