Tuning Carb on Stihl Professorial trimmer?

[jteuban]

Hi I am asking anyone who knows how to tune this type of Carb, a Stihl FS90 Trimmer. well actually in what order to turn adjustment screws if it matters, and how much to turn each time. I have worked on lawn mowers for about 7/8 years now but I still cannot get down tuning a Carb. I have only had it about a year a now it bogs down when you hit the grass, or almost like you have no power. idk I always use fresh gas in lawn equipment. Stihl s are great, I would go buy another right now I am sure it just needs a carb tuning. Cheers guys

 

[BKBrown]

Have you checked your owners manual for carb settings ?

http://www.stihlusa.com/stihl_ownersmanuals/FS90_Manual.pdf

page 40

 

[jteuban]

Thanks, just what I needed.

 

[BKBrown]

OK - Glad to help. :biggrin:

Thanks, just what I needed.

 

[jteuban]

Sweet, Just fixed the prob. now im ready for mowing season.

 

[ronnie2]

Hi All
I have an FS106 which ran great until a couple of days ago - now it will only start, then run for a few seconds, and die. Dirt in carb? Air leak in gas pickup line? The pickup tube to the tank looks a bit iffy, likely a replacement (not necessarily the right piece looking at the parts illustrations) Any other ideas?
Thanks in advance
Ron