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conflicting spring rate info , please help

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I'm trying to fugure out the stock fork spring rate for an 06 yz 125. The manual says 40 . The marks on the springs are rubbed off, most techs and spring calculators say stock is 42. Can any one help me figure this out ? Ide like to try the stock springs from my sons 125 on my yz 250. I weigh 155lbs in street clothes and think they may work a bit better but 40's in the forks would be a bit soft. Thanks

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