Did you have the rear fender off lately, maybe not "plugged" in right or maybe your swingarm carrier bearing is shot on that side ?
If it was a weak shock both sides would be equally sagging, well if it has just one shock that is....I don't know what model a 400 FGA is ?
If two shocks maybe preload somehow changed to softest although can't see how that could happen.
Last edited by Huffa; 11-18-2010 at 05:34 PM.
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