Re: NS90A initial idle needle setting.
No one can tell you that. It will vary from motor to motor, and carb to carb, and it will be different at different elevations. You need to make that adjustment per the Factory service manual. In a nutshell, the motor will probably start with the pilot screws somewhere around 2 turns out. Verify the link adjustments, warm up the motor, and sync the carbs from there.