View Full Version : stihl weedeater

matt m
08-05-2010, 06:15 PM
fs 90,,,,,,,i think
runs and runs ok i just cant seem to get it to go any higher on the rpm range no i dont have a tach but it sounds like its not getting enough fuel at hi rpms and just stops going higher tryed to adjust the hi end neddle but with no results i can get it to drop in rpm just not go up please help thanks matt

08-05-2010, 06:48 PM
Do you still have the guard on your trimmer?

matt m
08-05-2010, 07:56 PM

08-05-2010, 08:01 PM
In other words, shorten your line. The guard is there for a reason.
Stihls have a governed ignition coil. So you cannot over rev.

08-05-2010, 08:20 PM
The debris guard. Many people take it off to run out the line. I have done it on my trimmer but it will not allow you to rev up. It's hard on the clutch because I have noticed some discoloring around the vent for the clutch. My same model edger doesn't have this happening and it's a year older.

08-05-2010, 11:18 PM
I am sorry but the Stihl Fs90 is a brush cutter, not the weedeater you're speaking of.

08-06-2010, 12:11 AM
Brushcutter according to Stihl... It's the same concept if he doesn't run a debris shield. It most likely has to much line out thus causing lower RPMS.

08-06-2010, 01:30 AM
4 Mix engines have a completely different sound. Get a tach.

08-06-2010, 01:47 AM
You don't need a tachometer when you know you're not hitting the limiter