Anyone know what the idle speed of a 3020 gasser should be? I just picked up a late 70 one. Its the first gas tractor I've ever been around so I'm a little out of my element here. Just trying to go over it and get everything the way it should be. Also in the zenith carb it has what looks like a electronic fuel shut off solenoid or load control valve. The wire is unplugged so it obviously not doing anything, can this just be pulled and replaced with the old style load control valve?