with the IRS a little play is common, however not a quarter inch, that seems a bit much.
It could be a number of things, mainly the bearings or the carrier, or just the bushings. Either way its an easy fix. Buy yourself a service manual and just rip it apart. It should be painfully obvious what the problem is once you get in there.
* Spode Freestyler *
Team Spode Racing
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2004 YFZ450