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Removed from 2016 Yamaha YZ250X (Stock Weight)
Part #5UP-85550-02-00
Over $200 for a new one, this is used and in great shape.
Would be a great Mod for your Track bike YZ without this X Flywheel if you trail ride it.
You can read about this Mod in several forums, and also see if it will work for your bike.
I think Will Fit quite a few years Yamaha 2 Strokes.