I did try to extract the valve,but was loathe to punch it to hard fearing I might damage the casing.Anyway I do have another saw with the same configuration and the same trouble.I rebuilt the carb and fitted it to the010AV, same trouble ,fires but won't idle.Itied the throttle wide open and she fired and ran first time but of course over revved.Flicked the throttle off and she died.I have adjusted the carb every possible way, but the results are the same,fires once then nothing ,clean plug ,express excess fuel ,pull her over fires once.