Please do not give up Norm. We will never get another other engine to run a Super 24 like a Victa. They need a two stroke and what else is there? I know we have talked about those Suzuki clones at times but they are expensive, a bit small and they are known for carby issues as well.
I must admit that I have had the best results with old plastic needles although both my metal needles are OK at the moment. I think there is something in shaking the whole mower a bit before and after starting. I do that as a routine but its not the type of thing your customers will like to hear.
How are you anyway? I hope your operation went well and your are recovering well. Can you get down to your workshop yet? All will seem much better when you can.