Howdy all. I have a '58 601. Up until now its been running great. Lately, it's been starting and running normally. However after running for a little while it will just shut down. It seems like it chokes out. If I wait a few minutes, it will restart - with a little coaxing. It continues to do this until I give it a long rest. I've changed out the thermostat - thought it might be overheating. However after replacing thermostat and cleaning cooling system, it is still doing what it was doing before. Any thoughts from anyone? I love my 601. Wanna keep it running! Thanks in advance for your help!