I rebuilt the whole motor myself last fall. Stuffed crank, new seals and bearings, new everything.
I set my timing using a timing light. I will recheck it this weekend but I set to 17* btdc.
I've dumped close to $250-300 into diagnosing this issue so I'm pretty frustrated as I feel live I've tried everything. I will get a video this weekend of it running and idling. It sounds like it runs rich in general, at any power point (idle, takeoff, top end). I have a temp gauge so not concerned I'll seize it, maybe I need to try a 100 jet? Seems so far from the 140-180 people are using with a 70cc kit