RE: Port angles
Called CC and they recommended 2" band, spoke to another well known vendor and they recommended zero band. Who do you trust? No one, research and learn what it's about.
Playing with the calculator it appears that RPM is what effects the size and shape the most.
My son turns 3 next month, it's all about why for him. When do adults stop asking why? For me never!
A few have commented that the calculator is obsolete. What's obsolete about it, is math obosolete, 2 stroke engines?