I just received the MM-5 Stirling engine and put it together. The
first time that I ran it, it ran like a champ. After doing several
trials with hot water and a 60 watt light it was set aside for two
days. Tried to run it again and the performance is very poor. It
barely makes 4 minutes on hot water and it runs very slowly. I have
retested for an air leak, and it still passes that test. I do not
know what to do and my son needs to demonstrate it for his science
fair project. Please help!