Yes I have to agree with grumpy here.As I have had this very problem before.My VC-160 Auto Drive Mark IV,it had an orange spark and it just would not run.I just went and changed the whole ignition and got a blue spark.It ran like a dream and is still running today the same way.Still very interesting reading,but to call it a wives tale.Hmm it has worked for me.

Here for a good time,not a long time.