Super Stock® Ignition Kit for HD® Evolution® 111", 117", and 124" 1984-'99Like the S&S Intelligent Spark Technology (IST) ignition, the S&S Super Stock ignition system features a break in rev limit function. The break in rev limit protects a new engine from damage with a fairly low initial rev limit. As the new engine accumulates running time, the rev limit is gradually increased. After 24 hours of operation the rev limit reaches the maximum of 6300 rpm. All Super Stock ignitions sold with S&S complete engines have the