The Green Industry's Resource Center

Old 08-25-2009, 10:56 AM
sealcoatnow sealcoatnow is online now
LawnSite Member
Join Date: Aug 2008
Location: Northern Virginia
Posts: 63
Stihl FS110 4mix Cutting out High RPM'S

Can anyone give me some advice on this?
I have a FS110 with 25-2 trimmer head. It runs excellent and starts easily until under a load at high RPM's. It will rev fine until I attack really tall grass. it almost seems like an electrical problem as it cuts right off. I can keep it running if I close the throttle-it goes to idle. Running clean fresh gas, filter looks good and unit is about 2 years old. Never had the Spark Arrestor out but not sure if this would do it. Any help is appreciated.
Reply With Quote
Old 08-26-2009, 04:06 AM
topsites topsites is offline
LawnSite Fanatic
Join Date: Mar 2005
Location: Richmond Virginia
Posts: 21,659
Coil or carburetor, sorry I'm not sure which one right now and I'm also assuming
a lot of stuff, like you already put a new air filter and a new spark plug in it.
Reply With Quote
Old 08-26-2009, 02:43 PM
1998tahoe's Avatar
1998tahoe 1998tahoe is offline
LawnSite Member
Join Date: Dec 2007
Location: Jackson TN
Posts: 233
Sounds like carb needs adjusting. Sounds like maybe going lean. My fs90 don same thing back in spring, service guy adjusted carb and ready to go.
GrassHopper 335 61" 35HP Vanguard
GrassHopper 335 61" 35HP Vanguard
Stihl FS-130 4-MIX Trimmer
Stihl FS-130 4-Mix Trimmer
Stihl FC95 Edger
Stihl FC90 Edger
Stihl HS-90 Extended Reach Hedge Trimmer
Stihl BR600 Magnum Blower X 2
Stihl BG-86 Blower
Stihl MS-250
Stihl MS-250
Stihl MS-290
Stihl HS-81 R 30" & T 24"
MM-55 Yard Boss
Honda HRX217 Walk Behind

1997 Chevy 3500 Flat Bed
2008 Honda Rincon 680
John Deere 4320 Tractor:
Reply With Quote
Old 08-26-2009, 08:27 PM
Two Seasons's Avatar
Two Seasons Two Seasons is offline
LawnSite Senior Member
Join Date: Jun 2007
Location: Waukesha, WI
Posts: 791
Sounds like a combo problem.
1.) Take the screen out and clean it with gas.
2.) Mix up a new batch of 92 octane with Stihl HP Ultra oil
3.) Check the valve gap for 0.015"---if you can't do it, dealer will for about $40.
We like orange machines!
Reply With Quote
Old 08-26-2009, 11:43 PM
mowerknower mowerknower is offline
LawnSite Senior Member
Join Date: Aug 2008
Location: obamanation
Posts: 766
Not likely the coil, usually if those coils fail they will start up but not accelerate at all. Most likely a fuel delivery issue. Just out of curiousity have you replaced the plug yet. not saying it could be the problem but I did have an issue with this before
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Layout Style:

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Grand View Media
All times are GMT -4. The time now is 04:20 AM.

Page generated in 0.06718 seconds with 8 queries