AVB on these Victa carbies there is no way of adjusting the mixture, the only variable is a few different main jets, but they are rare. Anyway this mower after he got rid of the ethanol fuel, he said he dumped it, now is running a nice black coloured plug as it should. Only thing changed was the ethanol. I am well aware that some people try to cover up their mistake by changing the fuel after the event and with this motor I was only a few minutes away from pulling off the head to prove to he and his mate that it had been straight fueled, glad I didn't I would have looked a bit silly
