Dont have exact numbers for you but,,,,,,,, its supposed to be like 10 pounds or so. So if the WR is better suited to you, if you ride woods and trails it is, the dry weight is not much of a factor compared to the WR creature comforts. Tip,,,, the thing holds crazy amounts of fuel that you wont use in one ride unless your crossing the desert WFO all day, so leave like 1 to 2 gallons out of that tank and save yourself 10 to 15 lbs in high swooching weight :) .
Above weight measurements suggest the YZ 400 F weighes only 2 Kilos more than the WR 250 F ,,,, really?