Some items from this specific schematic: Bolt ,12x16, Washer, Bearing, Gear,crank Bal Driven(nt:46).
The most reasonably priced component used on the Dr250s 1986 (g) (e01 E04 E15 E18 E21 E22 E24 E39) Crank Balancer is the Key 4mm.
This CRANK BALANCER assembly utilises six Spring(s) - the highest specified component.