My motor was running well at low rpm's, loss of power as i increased the throttle. I was told to rebuild carbs (that the high speed orifices were clogged), and that very well could be the case. But, when i removed the fuel pump hose i noticed the cork gasket inside was all shriviled up. No leakage outside, but it looked pretty old and messed up. Should I just replace it and run it before i rebuild the carbs?