This CRANKCASE assembly utilises four Bolt,socket(s) - the highest specified component.
The sixteen Tt250r Tt250rc 2000 (y) Usa California Crankcase component parts are all listed in this schematic.
A sample from the products for the Crankcase include: Bolt,socket, Plug, Drain (3r4), Gasket 256113960000, Clamp(4aj).