Well, I drained all the old gas, washed the tank out with a hose, let it drain for a couple of days then added new gas. Replaced the old rubber gas lines and the filter. Changed the oil and filter, oiled the pistons, used the air hose trick, turned it over by hand and oiled the pistons again. Primed the oil pump with a screw driver and then turned it by hand again. Cranked it without the spark plugs for a little bit and then tried to start it with the spark plugs in it. Wouldn't start at first. Emptied the old gas out of the float bowls, disconnected the gas line and cranked the engine to get all the old gas out of the lines. Connected the gas line and then it fired right up and runs fine.