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Have a model 446777-type 0115E1 Briggs I have cleaned carb new gasket kit,cleaned and set valves new gaskets, good spark, 1.5lbs fuel pressure,around 95 lbs compression on both cylinders, new flywheel key. (not sure how to check or set timming) Engine runs good at high speed under load and with...

Engine runs normal at high speed with or without load,but at idle it runs rough with a rhythmic idle and will backfire threw carb. Rebuilt carb. This carb does not have a needle valve just a plastic cone that sits over elc. solnoid. Modle is 446777 with a nikki 698494 carb. Or could I have a...