[QUOTE=haydnc;9969353]I will say that 125 psi EXACTLY is not a safety requirement because according to the manufacturer (and I have a letter from them) it is not a requirement.
I'll tell you what is a safety issue, 2 plugs failing on the one cylinder, after coming out of maintenance, right after it had been tested on a spark plug tester that was calibrated.
I know of a case where tghe awi saw a decal on the side of the sprak plug tester thst said you should change tbe grit after 500 plugs. He then made him run a book so that he would not exceed 500 plugs cleaning. He the said you could just run it on engines. So a lyco has 4 plugs so just put it as 1 engine the add it up before you get to 500 cleans.
True story
Ps most shop air dont go much beyound 80 psi. This is what we run with now calibrations on something that you dont even look at or need. Complete joke. Have you got your tool box steel rulers calibrated yet. If not better put a decal on it saying its not calibrated.