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how important can it be

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I gotta get 2 exhaust valves, stock are titanium, new titanium are 125 bucks a piece, steel are 35 a piece but suposed to run a little bit stiffer springs. my question is how important is it to run stiffer springs for steel valves, the motor is going to be used on a shifter kart so the rev limmiter will never be found so im not worried about valve float, do i really need to spend another 50 bucks on a little bit stiffer springs?

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Yes. Its very important you get the right springs

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yes, get the stiffer springs. The springs control the valves and keep them from floating at all rpm's, without the right springs(ask anyone with a CRF, me included) valve life is seriously shortened. I put SS valves in, heavy spring, seats, retainers, everything.

Do yourself a favor, do it all at once, you'll be happier with the results.

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