Just wondering will a 07 rear shock fit a 2009 YZ450F and what are the differences?
Yes, it will fit. Stock for stock, there's a slight difference in length, as I recall, but there was also a revision to the linkage rate as of '08 that may affect damping. The exchange piston (high speed compression) was also revised slightly in '08, but this was just a change to the size of the holes in the piston. Since they're bigger in the newer ones, so the old one can be changed to match.
I measured an 06 and 09 shock last night and bolt center to bolt center was the same.
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