Yes I am having this same issue. I own a 2014 Agility 50cc. I was tuning an old carb when the new one came in. Installed the new carb and now the bike won’t start. I keep trying to start until the carb gets flooded each time. The engine turns over, has a brand new spark plug that sparks, a full tank of gas with fuel being pumped to the engine( verified), a clean air box and new air filter as well. I would suspect a whole lot of things except it was running a little rich but perfectly fine other wise. and still nothing..any thoughts?? I could have wiggled something loose but I’ve been back over connections and wire harness. Reading through the manual the wiring diagram shows how the circuit runs through the starter relay, the rear brake sensor, the kill switch, and the throttle I believe. I guess I’m going to have to run circuit tests on each of these components to rule them out..?? I recently changed the oil and then re-changed the oil a week later because I thought I slightly over filled it. The week old oil seemed to be a bit dirty and black though ..any help would be appreciated.