Rebuilding motorcycle after timing chain skip 62K Km

Can’t put the pistons back from the bottom of the barrel. You have to insert them from the top, that means to disconnect the conrods from cranck shaft, a big can of worms.
 
It could be completely different with the 2.5s (I'd like to know for when I get to where you are), but on the 2.3s you can replace the pistons going in from underneath. You may have already explained why not on the new bikes, and I missed it (my bad).


 
I agree there is a way but it will be very difficult for me to do it at home. I don’t have many tools and infrastructure of a shop and buying more is problematic. The bike ate already a lot in terms of consumables and man hours. I am thinking about this.
 
This will take a very long time... The motorcycle sleeps in six boxes so it won't be a quick journey. We don't have often the chance to look into their guts carefully so I am sharing here my findings.
Are you going to resurface those valve faces? I can't believe how pitted they are. I imagine the seats in the head are similar.