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I run 2 Stihl 009s daily. Both saws have over 1000 hours and 120 psi compression. Saw A began smoking(a lot) but continues to run fine with no change in compression. I drained the bar oil tank and swapped carburetors between the two saws, saw A continues to smoke, saw B is unchanged. Same gas in...

Scag w/ 900 hrs Engaging the mower kills it. Running on only 1 cylinder- sometimes right, sometimes left. Constant fire to both sides. One side appears to be getting the majority of the fuel. Spraying carb cleaner down the throat of the dead side clears up the problem. At full throttle should...