The most reasonably priced component used on the Crf250r 2005 (5) Usa Balancer is the Bolt,hex.,6x16.
The Balancer is made up of components including this Shaft Comp,balanc which is the most expensive.
Some items from this specific schematic: Bearing,ball Radi, Gear,water Pump D, Bolt,hex.,6x16, Pl,bearing Hold.