None. And you arent alone. It’s not good for Jr or Sr when it comes to tag engines. Jr’s need a different engine for skusa, wka, and uspks. The fragmentation between different series couldn’t be worse. Everyone is pushing their own agenda$$$. Far too many options out their right now so no you cant just take your yamaha can and go anywhere and race like the old days. Vote with your wallet and pick one series that fits your liking. Knowing you personally, I would run uspks and some route 66 in can if I were you. It’s affordable and gives you more flexibility than tag. I just cant see investing in a leopard at the moment and with uspks not using the x30 I wouldn’t want to limit myself with that either. There is no perfect answer that’s for sure.