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matt m
08-05-2010, 05:15 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

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

matt m
08-05-2010, 06:56 PM
guard?????

mowerknower
08-05-2010, 07:01 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.

unkownfl
08-05-2010, 07:20 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.

topsites
08-05-2010, 10:18 PM
I am sorry but the Stihl Fs90 is a brush cutter, not the weedeater you're speaking of.

unkownfl
08-05-2010, 11:11 PM
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.

ricky86
08-06-2010, 12:30 AM
4 Mix engines have a completely different sound. Get a tach.

unkownfl
08-06-2010, 12:47 AM
You don't need a tachometer when you know you're not hitting the limiter