Actually it was at times a real loud backfire. At any rate I revisited This over the weekend. I didn't put any spacing back as I noticed after removing the spacer it did improve the way it ran. So, I turned the mixture screw all the way in and then backed it out two turns (2 1/2 seemed too much by ear). The backfire seems to have gone away. I have even tried to get it to backfire but it hasn't for two days now. It seems to run generally better and idles better. Thanks to the info I found on this site I think it's running like it should now.
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