I pulled the carby down on this again and stripped it and found there is a small jet that runs vertical next to the mixture screw. I removed this and there are 2 holes in the sides slightly offset and 1 very small hole straight down the centre of the jet that is only small enough for a piece of wire from a wire brush, I cleaned this out and used carb cleaner on the rest of it and used the compressor air gun to clean up before reassembling, using gasket solvent on the gaskets then I reassembled. I must be on the right track because it runs heaps better, throttle more responsive but still "hunts" slightly when throttled down towards idle but nowhere near as excessive. Maybe I should soak the carby for a day or so. It does idle down almost ok when slight choke is applied although does smoke a bit more due to choke being on slightly. Still in progress, very frustrating!!!! Cheers all!
