as mentioned above lots of variables ... don't under estimate a tiddler in the handsw of a capable rider. Power to weight ratio may make them closer than you think. I'm not a hardcore racer but I've smoked more than a few 450's, 250f's and 250 2ts off the line on my husky 144. Granted its the c class and none of us can ride but ... its 90% or more rider.
To answer part of your question for that vintage, your 250's are probably around 250#'s and the 125 is probably around 220#'s
my 08 husky 125 manual says its 203#'s dry. Oil up the motor and suspension and throw some gas in the tank, fluid in the rads and I bet its close to 220#
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