Chainsaw Repair

Im still having an oiler issue with mine. Seems after even one cut in 12" ash, the oiler hole on the bar is plugged solid. Besides the bar having a slight flare in the rails at the tail, there is absolutely nothing obvious. I'm stumped. The inner bar plate isn't bent or dirty. Its not in mint condition, but there isn't anything that I can see that would interfere with the mating surface of the bar an the oil port? The saw oils with the bar removed and it oils after I clean the bar out. Make one cut and the show stops 
Maybe try a new bar