I recently acquired a new project, a beaten up Massey Ferguson MF-12. The mower has obviously been messed with, and i'm not too familiar with older Tecumseh engines. From what I can tell it is pre-1966, because it uses a belt driven generator to start the engine, and also uses a points and condenser system to create spark. It was not running before, and I get nothing when i turn the key. If anybody has a wiring diagram that would be super helpful. Also is it possible to swap a more modern coil onto the engine instead of using a points and condenser system? Thank you for your help!