· ASM2005 converts an original single - phase system to a 3 - phase system on any EVO and S&S EVO · digitally calibrated for optimum charging level over a wide temperature range · rugged, billet aluminum regulator housing is highly polished for a custom look · regulator operation is self - temperature compensated to control heat and optimize service life · over - temperature protection prevents catastrophic heat failure under severe operating conditions · highly efficient power conversion means more charging current is available at lower speeds for maximum battery life and easier starting · system reaches full charge at 550 - 650 RPM! (factory system reaches full charge at 1000 RPM) Get that custom bike juiced up! Thunder Heart Performance is pleased to announce the availability of their new 3 - phase charging system for EVO - style motors . 3 - phase charging offers more current delivery over traditional 2 - phase systems to feed power - hungry accessories like today’s sophisticated EFI systems and other electrical accessories . Using a highly - efficient “series” regulator, the ASM2005 fits all EVO - style motors .   In addition, Thunder Heart has designed the system to utilize standard compensator shaft extensions, negating the need for 3 - phase specific compensator shaft components . All EVO and S&S EVO big twins 3 - phase charging provides more charging power across the RPM band for increased battery life and easier starting