Thank you so much for these recommendations it is greatly appreciated!!
The stock carb has some parts missing, coolant lines clogged, rusted and the slider is very worn etc. When looking at prices to replace the missing and bad looking stuff, it costs $$$. I took it apart now and started cleaning it, I found someone nearby who is selling parts of his DT125R and has a carb will meet him later this week. If I can't find a decent stock carb, I will look for the Dellorto.
The current chinese PWK in it I wouldn't risk running as the build quality is the worst I have ever seen. It's not just visually not appealing, the materials are so poor even the jets snapped during cleaning, housing is missing a piece on top etc. So beware this junk guys! Brand is most probably "Motoforce" based on similar listings.
The exhaust should be this one: https://www.athena.eu/en-gb/lightweight-racing-complete-exhaust-kit-P20782.htm
And the ignition is from a French manufacturer, Devmoto. They set a DT125R mapping by default on the ignition. This ignition doesn't control the power valve servo by default, if I am correct the Zeeltronic unit has this feature. Devmoto states on the website that it's possible to connect the two if you send the servo and the iginition unit to them as some modifications are required on the servo for this.
Do you think it could be worth it?