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inside the muffler there is a screen that gets all gummed up, take muffler assy. apart and clean screen, if you have a propane torch, this works well as you burn crud off it becomes ash and wipes or blows off. first link shows how. press the helpful button and follow me on fixya
http://www.csgnetwork.com/oilfuelcalc.html
In the Mix
All STIHL gasoline-powered equipment uses a 50:1 gasoline/oil mixture. The chart below can help you figure out the correct measurements to use. For high-performance fuel that requires no mixing, choose STIHL MotoMix® premixed fuel.
If memory serves, Stihl recommends a 50 to 1 mix ratio on the gas mixture...( 2.6 oz oil to 1 gal fuel ) I usually run mine just a smidge richer and run a mix of 45 to 1... ( 2.8 oz oil to 1 gal of fuel ) I also add about 1/2 oz of "Stabil" fuel stabilizer to the mix (holds down gumming of the fuel and keeps things running sweet)...hope this helps... ;-D
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