The Honda RS125 and 250 are from the HRC factory. They are purpose built race bikes never designed or meant for public road useage. That means they don't have an electrical system to support things like brake lights, turn signals, head lights, etc.

Now that's not to say people havent made then street legal and reg'd them. Was it Tom from the UK that has a street'd RS250? I know Andy knows who it is.

As for the NSR125 manual, dont know. but someone should jump in with info.
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Charles Gallant