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I did a top end on my Pro this summer. Also cleaned the VES and checked the reeds. I'm about 8-9 gallons in to my first tank @ 40-1. 3 issues, I am getting a periodic backfire when starting (still turns over) and also periodic stalls when using the PERC. The last issue is my tether is acting weird. The engine still runs for about a minute after its disconnect then stops. It won't ever start without it connected. It does run strong and feels and sounds fine. Are the first 2 issues just because I am running rich. Any ideas on the third?