On my bench unfortunately is a Stihl MS251 which has had a bunch of work done to it (by someone else) and we can't figure out why it won't run right. I tried to start it and it wouldn't do anything. I didn't check to see if it had any fuel in it. I'll do that next. I did take the muffler off and saw very minor scarring, maybe two or three small scratches and no stuck rings. It's supposedly had the carb rebuilt, new fuel filter, new spark plug and coil so it looks like my work is cut out for me... As usual, any suggestions will be appreciated.