Controls over-revving and launch RPM. The high limit controls the 5500 to 9250 RPM. The low, 2500 to 6250 launch limit, is used for clean consistant runs. Both are adjustable with 250 RPM increments. Complete with installation instructions.

Note: Compatible with carbon core supression spark plug cables only.

Note: Designed for use with most inductive electronic ignition on H-D engines. It cannot be used with capactive discharge (CDI) or points ignitions.