I have a Jonsered 2050. It has been running just fine for almost 20 years. Gas is fresh, oil is Echo brand, air filter is clean, plug has only about 10 hours on it, saw is cleaned after each use, blade is sharp, etc.
However, now it has a problem after running 10 minutes or so. The first thing I notice is it will bog down while cutting. Then, it will not run at all at wide open throttle. If I back the throttle off to about 3/4 I van get it to finish the cut. If I use it the next day, it will have the same symptoms after a while.
I would rather not take it to the shop if I can fix it myself. Any ideas?