What are the pros and cons of cast iron vs. aluminium barrel

[Weston-scooterist]

Going back to original post, I have a Gori sport 200 kit fitted, ive done a few thousand miles on it, good for 60mph + i run through airbox with a 22mm carb. As mentioned i like the idea that you get warned by an iron cylinder before it heat seizes, it nipped up on way back from Tenby after thrashing it downhill flat out, 30 seconds later i was on my way with no problems