As far as I am aware, there's nothing really "wrong" with a ZXR400H front-end, but I don't think it's particularly sophisticated either. If you have the forks and just want the look of the USD setup, then I can't seen any harm in it, but if it's being considered from a performance point of view, then Barry's suggestion is much better but inevitably much more expensive.
I would imagine that ZXR400H forks will still need to be re-valved and/or resprung which is going to add to the cost though.
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Andy.
NSR-WORLD.COM
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