Stihl FS55R Trimmer wont run under load
I have a Stihl FS55R string trimmer. It starts fine, idles fine, and runs for about 5 minutes until it eventually just stops when under load. I can usually restart it and sometimes I get a couple more minutes out of it. The unit is less than 2 years old, was stored over the winter empty, is using fresh fuel with Stihl Oil in it.
I found a message on this forum with someone with identical problems, so I tried several of the solutions. So far I have:
1) Removed and cleaned the spark arrestor. Originally I cleaned with carb cleaner and a brass brush. When that barely helped, I pulled it again and burned everything out with a propane torch. The spark arrestor is clean
2) Tried running totally without spark arrestor
3) Replaced spark plug
4) Replaced fuel filter
5) Tried adjusting fuel mix until the feed head barely started turning
6) Tried running with fuel cap off
The unit still does not function properly. The only other thing I can think of doing is to rebuild the carb but I dont have the parts, the know-how or the time. My local Stihl dealer cant get to it for almost a month.
Any help GREATLY appreciated!!