G'day there Blumbly, I have had a few red wines, I am finished work for this year.
Those carbys and tanks can be a pain, I have recently draw filed the warping out of the tanks and have found that this does solve starting issues.
Before starting I tip the mower towards the spark plug. This is a way of priming these. (for an easy start)
Make sure you pre load the automatic choke prior to tightening the carby screws down.
I will put a link in for another thread that will help you.
Enjoy all the fun you can possibly have with that.
From Mark

Thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=41715&gonew=1#UNREAD


Happy is he who penetrates the mystery of things.