Sorry I am just getting on to this conversation so iI am a little behind
The reason your engines are getting hot is they are not tuned to run together
both engines have to be running at the same rpm off the throttle control
set up one engine to run about 1000 to 1100 with the hydraulic contol throttle locked /disconnect the throttle lever from the carb andstart the 2nd engine and the adjust the second trottle to run at 1000 or 1100
Both engines must be turning at the same RPM within 50 rpm, the closer the better
Lots of luck!
Stew :
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