If its been a few years, you might pull the spark plugs out and put a bit of oil in each of the cylinders. Wait a few days, and then see if you can bar the thing over. I did that with my 47 jeep and it felt like it had some rough spots so I kept at it till all was smooth. Been running fine ever since. Jeep is easy to do though as it was designed to use a crank if need be.
