so tomorrow I am picking up a Exmark Metro 36". It was only used residentialy and I know the guy so I trust him. He says it has been sitting for 2 - 3 years and the gas is drained out of it. It will turn over and seems to have compression. I am thinking before I even try and make it run to change the oil, gas filter, spark plug, clean the carb, and replace the air filter. After I make sure it runs, as long as it runs as expected, I would then clean out the tank, change gas lines (if they are a little fishy looking), possibly the belt, cleaning all greasable fittings and putting fresh new grease everywhere it is needed. Anything else you can think of I might need to do?