Hi Rob,
I explored the carb on mine last week, its a CV type. Mine was spitting a lot when cold and at low rpm (turned out to be the pilot jet blocked through years of standing about), but also smelt very rich. I have a 195 main in mine and the needle is on the 3rd notch with 3 washers on top, i moved 1 washer below thinking it might help with the spitting at low revs but now seems like the pilot jet was the main cause of the spitting back so its running even richer now, i'll move the needle back down to lean off the midrange.