The Circlip is the most widely applied product in the EX250F15 NINJA 250R 2001 USA CALIFORNIA TRANSMISSION ( six times ).
Some items from this specific schematic: Collar,engine Sprocke, Gear,output 2nd,34t, Gear,output 3rd,31t, Gear,input 2nd,19t.
Check out any of the twenty-eight Transmission components enlisted.