I have 1921 T hasn't run for 20 years and I am trying to start it: All new timer, coils, plug and wiring harness. I turned the needle valve 1 1/2 turns off of the seat. I get a pop but no start. Is there a starting point used by for initial starting?
Are you pulling the choke and priming the motor? Do you have GOOD gas flow to and out of drain on carb? Are your plugs getting wet? Your needle adjustment sounds in the ball park.
depends on the carb, try 3/4 off the seat.
I agree 1½ turns out could be right. But it could also be too much. As Dan says, the best setting varies from carb to carb. I'd start at ¾ and go from there.
Does it have good compression on all 4 cylinders?