ok i don't have a cr125, but i just today installed a set of boyeson pro series dual stage reedS to the stock cage of the RM250 , it was a back to back test as i took it for a morning ride , got home and found the reeds had rocked up, so i slapped them in and took it for a ride, pretty much best bang for buck improvement not much diff to bottom end but midrange and top is awesome, i have a gnarly pipe and shorty so i already have enough bottom end, the bike is a weapon now!!!