I have a Wico OC that is putting out what I think is a weak spark. The spark looks like a dull yellow. Is that normal, or should it be blue? Anything I can do to improve the spark? There is plenty of info on the net about Wico mags, but not much at all about the OC model. I looked into having it rebuilt, but no luck on that either. I found one place that will do an outright exchange for a rebuilt unit. Hate to spend the money on something I can fix myself with a little help.