Hey guys. I gotta FS 91 I bought 3 years ago. It has maybe 5-6 tanks run thru it. I’ve had it to the dealer once already two years ago for a bogging issue. Seemed fine up until today. Got halfway thru trimming and it just started to bog when I got on the throttle. Tried adjusting the carb to no avail. Any ideas? Prob gonna drop it off tomorrow at the dealer.
A bog is usually a fuel problem , lack of fuel. Try loosening the fuel cap to allow air into the tank and try it again , maybe a clogged tank vent. Open up the high side needle a little , a limiter cap might be on there to prevent you from opening it up ; get rid of that if you have one. Just a couple things to try quick.
My 91 had no limiter caps so I'm sure yours doesn't either. Just the hex carb tool is all it takes, same on my 131. That kind of problem within 5 or 6 tanks is definitely way off, it could be a few things...
Does stihl make a commercial trimmer with a regular 2 stroke or is their whole commercial line 4 mix? Haven’t been real impressed with the 4 mix...
Yes just got a split shaft 2 stroke power head last month as I have chain saw, tiller and other attachments
Comes in 3 sizes. 91 110. 131. I got biggest because rototiller for just string trimmer too much power. saw blade attachment will drop 3” maple saplings
The dealer ended up adjusting the carb. Runs awesome now. Guess I have no idea how to adjust the carb on a 4 mix lol.
