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As the others said; when the springs are soft they float and basically the spring cannot control the opening and closing of the valve. Soft springs make turning RPMS hard to do and basically pointless as the motor has become less efficient and it doesn't make as much horsepower. Excessive valve float damages the seats and makes the valves sharp.
Speed9 is right about neding to check springs constantly, but in the racesaver series you should be able to go a long time before changing springs.
As a side note: Spring life has alot of determining factors. Proper spring selection,cam design,proper oiling,harmonics,proper valve train maintanence and spring material.
An example from my experience is our midget motor. We had a Ford that we turned 8600rpms. We had been using Crane springs. After 15 races we changed them and all we could get was Iskys. We put the ISKYS in and only got 8 races. After two changes, we switched back to the Cranes and went back to getting 15 races. Our motor was built by Brayton. Motors built by other manufactures would only get 2-4 races because of the cam design and parts used.
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