Run my 3 port R with the RB carb this weekend.
WAY better on bottom end, no bogging and could tune it very easy.
No movement of the carb like the GO was doing.
The overall power seemed the same although i did notice a slight decrease in fuel consumption but it wasn't perfectly tuned yet so i'll have to look at it again.
Did have the chance to try out the novarossi C6TF plug and was very good...great top end with good temps.