I'm changing mine because one of the leads has a higher resistance than it ought to. I didn't think the overall resistance was an issue until I read an article recently which explained how the spark worked. It needs volts to make the spark but current to maintain it, so if leads are too high resistance the spark will be weak because of less current flow. As I've been having a misfire on one of the cylinders this kind of makes sense. I'm hoping the new leads will sort that.
I'm getting my leads from Mr Retro Leads. Anthony is very helpful. I found a phone call was better than email. He'll build them to whatever design you want. Just ask.
