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Old 10-16-2012, 07:22 PM
greenfrog greenfrog is offline
LawnSite Member
Join Date: Apr 2007
Location: Fort Wayne, IN
Posts: 10
Stihl trimmer running poorly

I have a Stihl FS 100 RX trimmer and it shakes and sputters like it's running out of gas. The trimmer head continues to spin even without hitting the throttle. I replaced the carb and cleaned the exhust screen and it still is running poorly. Any suggestions would be much appreciated. Thanks!
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Old 10-17-2012, 01:00 AM
MR-G MR-G is offline
LawnSite Senior Member
Join Date: Aug 2010
Posts: 479
4 mix engines require that the valves be cleaned/decarbonized every so often....also check to see that no wires are bare and grounding out...check to see wires at coil are tight fitting....most likely the valves though...if they cant seat properly you in effect change the timing and cause the engine to skip a beat or a cycle....this could be causing higher idle and erratic performance. if none of this fixes it you could have a broken flywheel keyway causing the flywheel to slip on its shaft .(easy fix)
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Old 10-17-2012, 01:08 AM
Darryl G Darryl G is offline
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Join Date: May 2001
Posts: 8,038
They all run that way, get used to it

One thing that is often neglected in the fuel filter. I would replace that as well as all of the fuel lines.
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