Need some help on Stihl Trimmers

[DT Lawn Care]

Hey guys, before I get started, I want you to know that I did NOT buy these trimmers new. I got really good deals on them used, and I do know that they aren't in the commercial series. So please no replies saying "Dude, buy a new commercial trimmer".

Ok, here goes. I have 2 Stihl string trimmers. One is a FS44 straight shaft and the other is a FS36 curved. I bought the FS36 quite awhile ago, and pretty much right after I bought it, it pooped out. I bought the FS44 earlier this year. Same thing. I didn't even run a full head of string through it, only a few tanks of gas.

On both of them, I adjusted the High and Low screws on the carb, to no avail. I also adjusted the big screw, which I assume is the mixture screw. No luck.

Any suggestions would be helpful.

Thanks in advance.

[DT Lawn Care]

Any suggestions? Rob? It's kind of puzzling to me. BTW, I know that they both have had new spark plugs and new gas, so that's not part of the problem.

[SLR]

Muffler sceens clogged?Sounds coil related though.

[jkilov]

They could be worn out you know. The previous owner putting thick oil through the plug hole to give some compression before selling it :nono:.

A compression check would reveal the true state of these, but it's hardly worth doing. Get a new FS80, you can mess with them when you'll have the time.