Then the Question:
Does the 65 use less fuel and how does it tune comared to 63 and 69? I have asked before but it was when Nova announced it. Now, maybe someone have experience with it :-)
The 65 in theory is supposed to use less fuel. I have one on my clockwork btt and on some track I've been able to run 12 minutes full to empty. I never tired the stock carb on it so I can't tell you if it would be just as good on milage or not. The top end needle usually ends up in a similar place as the stock carb but since the low speed is so much different it's tricky to get set from the beginning. It super buried in but that's normal because of the different look of the slide. The smaller restrictor you use like any carb it will be more sensitive to needle adjustments.