Reply To: Hello from Germany, work on it til it runs – GV125M E3 2007 Carby
What rubber pipes and o rings do you mean?
Pipes = Sorry i meant the intake manifolds (which hold the carbs down to the cylinder heads) , so they also have o-rings in them, so if one of them got deformed during re-install or are too old , you could have a micro leak that has made the vacuum system weaker. Also make sure both front and rear intake pipe share vacuum to open the fuel pump. (2 intake pipes feeding the vacuum pump in a shared T-Junction (T-Piece) = better chance of fuel flow)
If you see any egr parts (ais parts) get rid of it, your vacuum system will thank you, look here:
[How to Tutorial] AIS Removal Guide – Hyosung GV125 GV125C (EGR Blank Kit Fitting Guide)