Thank you all, I have a few things to try then. Thank you Dan for the resources, the 1920 guide was exactly what I was looking for.
I can do valves but I see it needs a nicely warmed up engine to be accurate, I can't really get there (I get about a minute). The car purrs when I have it on the throttle during those first few cold moments so I would surprised, but I get the logic as it expands. I will look at the economizer plate, perhaps a rebuilt kit will get my more familiar with the thing as I go through that process so I may start there too.
This is early days for me and I usually get to grips after finding out everything not to do. It's nice to have a direction to point my grubby hands to! Thanks again.
