I am also getting into shifters and I plan on running the NESKS and would love to hear more on what is legal and what is not. It is my understanding that NESKS has the stock Honda (which the ignition/electronics, porting, carburetor, combustion chamber all have to be stock and use a 99 or 01 cylinder). I don’t think they run a modified Honda class. They run the ICC and moto engine shifter karts at the same time but score them separately. I am not 100% on all this and would love to hear more on the topic.