I have a 2001 rm125 and it Boggs when I give it throttle quickly on the low end. I just rebuilt the motor, carb, new stator and bunch of other things but it just keeps bogging. Air filter is clean. I don’t know what else it could be, looking for any suggestions.
Have you tried making the idle mixture richer by screwing the air screw in?
There is a delay between idle jet fuel and throttle jet fuel getting to the airflow, which can make for a bog on quick throttle applications.
Richening the idle mix can prevent this by having enough fuel already in the airflow for the delay duration.
Some carburetors use accelerator pumps to mitigate this. Most smaller 2Ts just need more fuel at idle.