not sure about the carbs. However the forks are odd? Never seen that box at the bottom of the forks? I know my 01 RS250 forks have an adjuster there, but nothing like a large box like the ones in the pics? Also, the top fork clamp would be questionable to me. HRC never put an ignition lock/tumbler on the RS so not sure why there would be a place to put one on these?

The swing arm looks NSR, as the RS was a right side drive. The swing arm in your picture is a left side drive.
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Charles Gallant