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I had the wheel off my KTM LC4 640 SM, and I noticed when compressing the left side fork, it sounded different than the right side fork. I took them both off the bike and the right side for definitely has a distinct rattle to it. Its overall length is longer when decompressed, and it seems like it springs back much faster than the left side fork as in it's underdamped.
I have no idea why it's doing this. Could it be low on fork oil, or could it be missing a spacer, or something along those lines?