OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Trimmers and Brushcutters Two Stroke Trimmers & Brushcutters Stihl stopped working, trying to fix...

As above typically is just a blocked muffler, however could be a few things..

From stihl themselves the proper way to check the carburettor is to pressure test it, mainly by pressurising the fuel inlet line and making sure it holds. Have you put a kit in it?

There are a few circuits in the carb that you can't check or clean without removing welsh plugs, but carb issues like that are usually only a problem if it hasn't run in a long time

Also check the fuel lines and filter, a tiny hole in the fuel line or blocked filter will do exactly this

Not sure why you tried it with the screws all the way in? that will stop all fuel from going through the carburettor. 1 1/2 turns out is usually where i would start

A compression test won't tell you very much other than if the rings are ok, and I am assuming you have done the visual check through the exhaust port..

Only other real test for a 2 stroke is a crankcase pressure test to check the crank seals are holding, Unlikely being quite new but not impossible