I left my wooped 03 wr450 141" x 2.5" bike for a fuelie KTM with 121 2.5" track. Road the same last spring, was good and easier to lift than my wr. A 2 stroke bike has in most cases a lot lower center of gravity than the 4 strokes............so even at the same weight the agility factor and lifting weight will be lower with a 2 stroke. I have the 2 stroke with kit also...........problem is early season deep powder days my 4 strokes have out performed the 2 stroke in the DEEP SNOW.
If somebody made an adequate 2 stroke I would own one, the mods you have to make to a 300 or old 500's just doesn't suit me.
I just ordered a new hoist scale and will check here in a month the weights with old bikes vs new bike and two strokes. At 67 I don't pick them up off flat ground. I have some great younger friends I ride with, they have always eventually come back to help.
just FYI. Hung a brand new XC 300 2017 from shops digital scale 218 lb fuel tank empty ,