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Top end rebuild help

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I have a 2006 crf450r and I just sent my cylinder head to be machined to do my valves. I had everything separated I went to go get my valve springs and they were out of the bag I had them in to separate them. So here is my question. How can you tell the difference between intake and exhaust springs. My guess is that exhaust springs are stiffer than the intakes. But who knows that's just a guess. 👍

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Awesome. Thanks for the info guys. Got the head back and now it's time to put this guy back together.

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