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Update : An inquiry was sent to walbro in requards to the pop off pressure settings . Here is the responce : ***************************** Luis Salas Program Manager - Aftermarket Walbro Engine Management 6242-A Garfield Avenue, Cass City, Mi 48726 " The Bottom line to pop off pressure is that the inlet needle pops off at some pressure. With leaner calibrations, heavier or stronger metering springs, smaller seat orfices and other variables the pop off pressure can vary. We expanded our pressure tester to go from 0-60psi because of these variations. We do not have a set pop off pressure based on this information. The pop off pressure for consumer applications is not that critical . However, in professional or high performance applications such as kart racing and the like , pop off pressure is more critical. 
Nope this is exactually what I suspected when first putting this thing under the microscope. No published specifications to be found anywhere. Boy we got the dogs on them now . Hi - What would be helpful though is readings taken from some old Macs prior to all this hog wash.
Nope this is exactually what I suspected when first putting this thing under the microscope. No published specifications to be found anywhere. Boy we got the dogs on them now . Hi - What would be helpful though is readings taken from some old Macs prior to all this hog wash. 
