I have two Stihl 4-Mix engines on the pole saw and straight shaft brush cutter, as well as a Stihl 023L chain saw. Run Amsoil 2-cycle oil at 100:1 mix; been running for years with no issues. No screen plugging or carburetor issues not caused by me. I had to replace one carb due to very fine dirt in the fuel, which clogged up the passageways; no damage to the engine, thank goodness. Couldn't clean it adequately. I also use regular 87 octane pump gas, with Sta-Bil in it, as I keep about 50 gallons on hand for these tools, the zero-turn and 8N tractor.
You might have a plugged tank vent. Does the time vary if the tank is full or empty? Faulty crankshaft seals can cause poor running, as well, due to loss of vacuum in the crankcase. Checking the screen would be the easiest thing to do. zuhnc
This post was edited by zuhnc on 07/08/2021 at 08:50 pm.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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