[poff]

The choke is a flap that restricts the air flow in to the carb. to help cold starts.

A divorced choke is a bimetal spring mounted on the intake manifold. There is a port under the intake that lets coolant or exhuast (can't remember which) heat up the spring to operate the choke.

Describe the heat riser.

The stove pipe (in theory) diverts hot air that passes by the exhaust manifold into the air cleaner to speed up the warm up process. A properly operating system has a vacuum operated heat valve that diverts back to cold air once the air cleaner warms up.

A properly working and adjusted divorced choke should work fine. The only problem I had with mine is the spring went bad once. It would be better to convert to an electric choke carb.