So is the distance to which the thermocouple is inserted is critical to accurate temps? When I built my MW-54 kit recently, I mounted the thermocouple so that it was inserted about 4mm, but I didn't measure exactly. I'm getting pretty high EGT temps, that seem to be limiting the max rpm to about 156,000 - where the EGT is measuring ~730 degrees. So from the above comment, I take it I should have less of the thermocouple tip inserted? How can I tell whether or not the engine is actually overheating?