I have a Stihl, model I think is 026. It's about 25 years old now and has seen only light homeowner use, tree trimming and storm cleanup, along with a few occasions of cutting up about 8 large oaks that had to be taken down .
It has a 16" bar and a 42 or 46cc engine, cannot remember which.
I aways empty the fuel tank and run the carb dry when finished. I use the recommended higher octane gas, and have always used Stihl 2 cycle oil, switching to their synthetic when it came available 5-6 years ago.
It has never failed to start and perform as designed.