Hi, Ive a old Snapper ride on mower with a B/Stratton 11 hp engine. It runs up ok but after a while under load it dies back and gives of black smoke a quick adjustment to the jet at the bottom of the float corrects things Has any body got any ideas Thank you Rob
I would say the carburettor is worn.Check the brass float,fuel inlet needle,emulsion tube,idle valve and throttle shaft.If the throttle shaft is badly worn you will never get it to run satisfactorily.Buy a carb rebuild kit and provided the rest of the engine is in good mechanical order it should be ok.