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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