Re: What diameter (mm) is standard ignition wire? Ill. Home › Forum › Ask A Member › What diameter (mm) is standard ignition wire? Ill. › Re: What diameter (mm) is standard ignition wire? Ill. keesInternational Member - 2 YearsReplies: 516Topics: 17 November 19, 2015 at 9:50 pm #27386 . I should say , YES at least, I always use it. 😎 .