Stihl string trimmer Original Message Jul 12, 2013 11:34 am
I have a Stihl string trimmer with the KM90R engine. I think this is a 4 stroke engine which uses mixed gas. It is about 5 years old, and I use it weekly during the grass growing seasons. Recently, I've noticed that there's a reduction of power and the engine does not rev up and down as quickly. The throttle response has gotten sluggish and there's a noticeable power loss at the top end.
Before I open things up or pour in some magic elixir (fuel additive), is there anything I can check or try to narrow down the problem?
