power jets were developed at first for 2 strokes running continous wot ;D whereas the venturi effect of the slide is no longer even happening as they are smooth bore at wot
pressure drop at the main jet relies strictly on the airbell of the carb to speed up the air
lean afr conditions and the wot seizures were an issue,specially at high speeds :'( that that forced the developement of a powerjet into use i think it was sparky at lectron that actually perfected the deal
the ones i am familiar with are not wired, they simply work by pretty much inventive genius