Join Date: Jun 2018
Location: Pennsylvania, USA
I do not think you will be at any loss for going with BS4 over BS6 from what I saw on your link.
The BS6 may actually have a little less power due to stricter emissions which usually means it will run leaner than BS4.
I would just get BS4 as they have already been proven and if there is an issue with BS6, you will be stuck with it.
2018 BMW G310GS White
2017 Hyosung GD250R Black/Gray
2016 KTM RC390
2014 Kawasaki Ninja 300 SE (sold)
2008 Hyosung GT250R (crashed)
199x Kawasaki Ninja 250 (engine failure)