54 sounds very stiff to me. I have KYB SSS forks from a 2007 YZ450F on my 2000 XC300. I used the RaceTech calculator and they estimated 48 for me when I weighed 245 lbs for Enduro B. I am down to 235lbs and I wanted it a bit softer so I went back to the stock 47 springs.
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