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It should idle when warm at around 1100 even with points. I'm guessing the cold idle may be a problem, but I don't know Boyer - if so, then you probably would need to hold it a little open to keep it running. With points you do. The choke is the opposite of helping there.One thing to check is for air leaks. That's generally not a problem carb to manifold, but sometimes manifold to head. A quick but messy way to check is a little grease smeared all around that junction. The other is the manifold crossover tube. Sometimes they are cracked and not noticed. Any air leak will really mess with starting and idle for the same reason I said earlier.Another is that the way the throttle cables are on a Norton, they can get caught on the carb top or junction if there is too much slack. The carbs must be sync'ed (slides lift exactly the same) and the cables should have a little slack.
It should idle when warm at around 1100 even with points. I'm guessing the cold idle may be a problem, but I don't know Boyer - if so, then you probably would need to hold it a little open to keep it running. With points you do. The choke is the opposite of helping there.
One thing to check is for air leaks. That's generally not a problem carb to manifold, but sometimes manifold to head. A quick but messy way to check is a little grease smeared all around that junction. The other is the manifold crossover tube. Sometimes they are cracked and not noticed. Any air leak will really mess with starting and idle for the same reason I said earlier.
Another is that the way the throttle cables are on a Norton, they can get caught on the carb top or junction if there is too much slack. The carbs must be sync'ed (slides lift exactly the same) and the cables should have a little slack.
