I have one tailpipe (back engine block) putting up black smoke and fire w/ throttle. Bucs hard at 1/4-1/2 throttle. I have played with the mixture screws all the way from 1/2 turn to 3 turns
1/2 turn = pings at idle, afterfire on decel, bucks hard... all symptoms of lean.
1 - 3 turns = a...