I decided to weigh my bikes - both without fuel. I used a basic 300 lb. bathroom scale that I tared at 230 pounds with weights from my son's set. The bikes were lifted on an ATV/MC hydraulic jack. Based upon published ready-to-ride weight of the CRF and what I've added to the bike I'd say the following weights are pretty close.
2003 EC300 with: Bark busters, radiator guards, shark fin, gnarly pipe, pipe guard, skid plate, number plate, fastway footpegs, simple wiring harness.
254 pounds. (~269 with full 2.5 gal tank)
2012 CRF250R with: Bark busters, radiator guards, skid plate, hour meter, o-ring chain, oversized tank, spark arrestor, pro taper bars, bar pad.
227 pounds. (~241 with full 2.3 gal tank)