Just a word of warning. There are many sellers offering NSR250 Petcocks/Fuel Taps on some of the auction sites.

These petcocks will technically work, but are not direct replacements. The petcocks being advertised are most likely from an early/mid 90's CBR900RR (Also called Fire Blade in the UK).

Why do I say they will "technically" work? Because they will screw onto the NSR Fuel tank and the fuel flow rate is the same as the NSR250. However, the reserve tube and the filter are longer (you can pull these and use your old NSR filter/reserve tube) then the NSR250. Also, where the fuel line connects comes out of the petcock at a different position and angle then the NSR250 fuel petcock. If you are running without an airbox, this is fine, otherwise, the fuel line will end up not get around the airbox and make mounting angle very difficult.
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Charles Gallant