Bret, from what I rember it has a 19mm intake (correct me if I'm wrong) and from reading the two-stroke tuners manual it seems that having a carb that is a little bit larger thn your intake is good because it reduces condonsation effects, so I decided on a 20. plus I'm gonna match the intakes obviously so it's not an abrupt change from large to smaller.
Mike, why'd you do that?