The most reasonably priced component used on the Cr125r 2003 (3) Canada Cylinder/cylinder Head (cr125r2,3) is the Bolt,recessed,6x1.
Some items from this specific schematic: Seal,exh Joint, Bolt,stud,special, Bolt,flange,sh,6x14, Joint,exh Pipe.
The most expensive part in this assembly is the Cylinder Comp,a.