I have seen many videos on upgrades. Mostly they are for pitbikes but same engine.
Rarely have I seen a full set of upgrades

I have seen how the racing cdi box makes little to no difference.
not seen anyone use the cdi box, upgraded carb from 19/20mm to 24mm or bigger. and then I would assume some sort of cam to let the engine rev higher. or maybe springs I hvae to do this upgrade on 212 predators
also no one seems to have tested did the rpms go higher after the cdi install since it has no rev limiter. If i can find my rpm gauge i should test this
my 110cc really feels like it could go faster
the bigger carb / intake seems to hit the starter even though it does angle the carb off to the side. I made it work on my 110cc go cart by flipping it around 180 degrees.

How big can I make the 125cc? is it worth it?