Mike
There are really only a couple of areas of concern for a Tag. As Chuck pointed out, the carb. Just make sure you put all the jets back to stock Rotax specs. The seal is intact with a passport. If there is a fuel filter is in front of the pump, it must say Rotax. The stock radiator is in place. Thats about it.
The deal killer last year was the tires. The chassis setup is very different between the Mojos and the MGs, it wasn’t worth it to make the changes. Worse, they are extensive (mainly seat postion). The other area is front brakes, RMax allows them. But again, a Gatorz has shown, the local series doesn’t have to permit them if they don’t want to.
I see it as a win-win for both racers and track owners. We get more options, they get more money.