Preface by saying, I had to google Honda 420 Rancher. With no more information such as AF tint, I'm going say it likely uses same AF type as their vehicles, Asian PHoat AF. Right now Valvoline/Zerex Asian blue tint available at WM for ~$13/gal, best readily available everyday price.
I did go to one Honda ATV site and Honda (Type2) Phoat is what was recommended. I don't believe you can go wrong with the Val/Zerex Asian prior recommended.