Just a guess, but does the NS250R run two CDI's like the 1987 NSR250? If so, I'd suspect the corresponding CDI. See if you can swap them over if that's the case.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!