Lately we've had a few overseas Yamaha WR250 and WR450 riders order the wrong YamaLink part. They've shipped over a 2005 lowering link when in fact their bike is a 2004 model. Here is the big difference: the 2004 stock suspension rocker looks like the picture attached. It has TWO large pivot bushings and pins. The 2005 and newer has smaller bushings and separate pins.
If your Yamaha rocker looks like this you do NOT have a 2005 YamaLink coming your way. You should have a 2004 or older YamaLink.
Found this vid last night. At about the 53 second mark #1 does a crazy triple/triple. I like the "reaction" the guy in the stands has, almost like "Oh, okay, will this be over in time for my 10:30 showing of Cirque du Soleil?"