Are these new machines? I am surprised at the big jet sizes you are having to use. I use a 2.5 " unifilter, modified carb, ported head and custom exhaust. I flow approx. 30% more air than stock. I only need a 127 jet. That's why it seems strange to me. Seems like you sucking a lot of air from somewhere. For our altitude, here in central N.C., a 130 jet can be way too rich if the motors are basically stock. If the machines are used , you may have a crack in the rubber intake,allowing extra air in. The stock rubber intakes are notorious for developing hairline cracks that cause all sorts of weird tuning problems. While the motor is at idle, spray some carb cleaner around the intake. If the idle speed picks up, you got leaks.
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