The customer I built it for took posession of it December 2020, I really don't know what it has gone through from then until now. All I would hear is how much of an animal it was from his personal mechanic that works on his car collection. Only idea I have is that the carbs are gunked up from no use and all of the backfiring caused the plugs to foul immediately. Look at all the smoke escaping the exhaust--Can you say over fueled and washed/glazed cylinder walls? Maybe even scuffed skirts. I'm sure he will get to the bottom of it, in the next couple of video installments. J.Rob