My wife's grandfather has a Husky 55 with an apparent oiler problem. This saw is only 3-4 years old and isn't run much. He ran the saw without oil and ruined a bar and chain. I got him a new 20" bar and chain and filled her up with oil. Checked and it seems to be oiling fine to me BEFORE I installed the new bar and chain. I blew all the old sawdust off around the clutch area and put on new bar and chain. He calls after running it only a little while and says sparks were flying off bar at bottom and doesn't think it's oiling. What could be the problem? He cross-threaded the oil cap and it leaks a minimal amount and can suck air - could this cause the problem? I am a beginner and need suggestions. Does the Husky 55 oil pump work off vacuum or a gear? Thanks.