This is the HiiSun Factory ATV 400 Carb, PD33J-A.
O.D. Air Box end = 52.5mm , O.D. Intake end = 38.25mm, Bore = 33mm.
This is the Best Choice for the UTV 400 (now discontinued). Not cheap copies, this weighs 2lbs. 11 oz. !
May need to reuse the thread mount if this is too lung for the Inner Wire to have slack.