Saving Old Seagulls

Thanks Andrew,
I don't know how to get notification when there's a reply so missed yours, sorry.
Is there a particular model of Bing or Villiers carb to look for ?
This one runs very well but takes ages to start. I'm using an electric drill on the flywheel nut since pulling the rope just doesn't do ...

Here are the diagrams.

Hello from sunny France,
I have recently picked up a GF Seagull. I checked compression, spark, clean fuel, and after some effort it started and runs fine.
I didn't let it run for long since it had emptied my bucket so wasn't getting enough depth of water, but I'll try it on a boat to see.
I was ...