Wonder if the check valve between the compressor and the tank is leaking back at higher pressures. A friend 40 years ago tried to put together a compressor from random parts. The check valve was missing from the tank he picked up and he didn't realize he needed one. The first problem he noticed was the motor slowed with each stroke once the pressure reached around 80 lb's and actually stalled the motor at a little over a hundred. It could not restart at cut on pressure. Granted this is an extreme case with no check valve but a leaky one could cause your problem I wound think. Not sure where the check valve is located on yours but if it is easy to get to unhook it at hi pressure unit shut off and do a soap bubble test on the valve.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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