I had a guy bring over a 46cc poulan with a 20 inch bar today and wanted me to look at it, he bought it new at the farm store and has only cut a load or 2 of wood with it, he said it wouldn't rev like it did when he bought it, the first thing i did was take off the air filter,what a piece of crap this saw is! the inside of the carb had a solid coating of sawdust that was sucked in from the bottom part of the filter,i blew it out and it didn't help it much so i told him to take it back and see if he could get his money back and i would get him a saw. I have never seen anything so cheap made as this saw,it's a wonder they even run at all.