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No need to ch manifolds. Lets see if we can solve it as is. heat riser sending heat up top?. Need a thin gasket on either side of the 1/2 black plastic phenolic spacer? E10 gas (ethanol) by chance. the eddy 750 may have an issue . Something besides the cast iron is causing the prob & if it is not heat related check for a good blue spark when hot

"E10 gas (ethanol) by chance"
... YES... every grade has 10% ethanol around here.......... I remember the days you could get leaded regular gas would that be the issue........... besides the restart the motor has been running great........