hi everyone, i was messing with my carb one day, i was tryin to do mechanical secondaries, but my secondaries dont even open all the way?? they only open about 1/4 and then i tried them by hand but still they only opend about 1/4, does anyone know why, maybe they had a factory limiter, i have a 1981 mazda rx7 gsl with vacuum secondaries right now. thanks in advance