This is an alternative option to the Yamaha spec 6206 bearing with 28mm ID. The common 6206 bearing has a 30mm ID and when used with the reducer bushing is a direct fit on the Sidewinder, Viper and FX Nytro models.  Bushing is sold with a quality bearing. Bearing supplied will vary between Nachi, NTN, or FAG depending on supply availability.  
 
Notch of bushing gets installed inward for a pry point in case it remains on shaft during a bearing removal.