Carbs or something else, maybe?

[unfazed]

Most likely carb icing.
There was a problem with the heater pipes being blocked on some of the Foxeye models,
Apparently during the build process some crap was lodged in the elbows of the heater pipes.
Remove the heater hoses see if you can blow through from one side to the other, if not and insert a small screwdriver or something into the carburettor pipes (the ones I cleared were both on the left side) and dislodge the dirt, then blow it out.