Bought a 49 A recently to do some chores at our farm. It ran OK when I looked at it but the owner said he hadn't run it more than a few times a year and when he had it on the grain auger it shut itself off after maybe 10 or fifteen minutes. The battery he had was weak but we jumped it and I attempted to drive it home. After maybe 10 minutes it started running real choppy, backfiring and puffing black, then stalled. I towed it home and noticed oil dripping out the gasket between the intake and carburetor. I figure I am going to change the mag cap, points, condenser and rotor as they all look to have been neglected. Drain the old gas, put new plugs and wires in and change the engine and oil bath oil. Anything else I should do before putting her back to work? And what causes oil to be pulled into the carb from the oil bath aside from incorrect weight?