My dad has a 272xp that he rebuilt with an aftermarket p&c last fall. Even before he rebuilt it it never had the power it had when he first had it. It didnt get better after he rebuilt it. The other day I checked it with the tachometer and we couldnt get it above 10,500 rpm WOT. It seems to run good at that rpm but doesnt have good power. I no saws arent as good with cheep p&c but 3000 rpm low seems really bad. Has anyone else had a similar problem or know what could cause this.