12mm to 17.5 mm carb Nov 15, 2017 16:02:59 GMT -5 via mobile Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by benji on Nov 15, 2017 16:02:59 GMT -5 Sounds about right. I had a 85 jet in my bugeye Zuma w 70cc bbk n OEM muffler.