I've just had a look through the manual for the CBR250 and it seems all the models from the MC17 through to the MC22 had various iterations of the MC14E motor (go figure...), I guess the variation was just in what was bolted to them in terms of carbs and cams and fuel pumps and whatnot.
The CBR250RR(L) has MC14E - (page 24-2), the CBR250R(J) is also listed as an MC14E powerplant (page 22-2), and the powerplant for all the models is listed as an MC14E unit at the front of the manual.
I learn something new every day, never ever bothered to check that before...
Anyway, in summary, the powerplant is correct for the bike, so I doubt it's been swapped![]()
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