Modern Vespa

Hi all, just bought a brand new PX 125.

The bike starts fine in the morning with a bit of choke, but after a while I ride, like 25/30 mins, when warmed up properly, it "bogs" and sputters at low revs. In first gear starting from a traffic light it's a nightmare, as I open the gas tends to die and sometime does, so I have to open really slow in neutral trying to reach higher revs playing with the clutch in order to start ending up consuming a lot of fuel.

Could it be the plug, carb settings or else?

Thanks,
WhitePX

make sure the choke isnt sticking, (check at the carb) even slightly can make a difference, might want to post this on the vintage forum, lots of 2T knowledge there

I thought about that, but if it was the case wouldn't the bike always bog and not just after the engine it's warm?

I have exactly the same problem with my PX 150, did you find the problem ?