I have seen these videos dongi, and notice this is not the GD we have for our market its an AX4 made for some other country remember GS150 mola has different specs and even weight in philipine then our local model of GS150...
Secondly, Jitni Der men GD 100kmh ki speed pakarti hai as seen in this video as well utni der men koi bhi 125 usay atleas 1km ahead ja chuka hota hai, there is a thing called torque which plays role in this case.
third GD brakes and tyres are no good from any speed ahead of 100kmh in any case as well..
4th in the videos you share the max he got out of GD is hardly 103kmh after might long runs, I mean GD is not made for speed its for comfortable commuting.. its so lame that we are putting it head to head with 125s just my point of view!