I just picked up a new sporty hardtail bike yesterday and have a question about how it runs (or doesn't). The bike will start with the carb fully choked, it runs fine, but has small "pops" out of the exhaust. As soon as you turn the choke off it dies. It has a S&S Super E carb on it. The guy had new pistons put in it last winter and he said it ran fine before this. He did have the cylinders bored. I haven't even had a chance to try anything as far as troubleshooting, but thought I'd post here to get a few idea's of what the problem might be and where to start. Let me know what you think.