Softail Requirements
• 2018-2020 H-D® M8 Softail models with 2 into 2 style
exhaust system
◦ Complete model breakdown of vehicles covered located here
▪ MK136B Model List
• PN 310-1296 Engine, Assembled, MK136B, Black Edition, Oil Cooled, 475G Cam, Black,
2018-up M8 Softail®
• Exhaust: Stock H-D header and Stock H-D catalyst Mufflers
• Air Cleaner: Stock H-D or Aftermarket Air Cleaner
• Customer has to run our specified combination to be emissions compliant
◦ Deviation from specified setup may result in improper engine performance and in which case S&S is not liable for technical support or troubleshooting.
Calibration
• 2018-2020 M8 Softail Models
◦ Calibration is locked. Customers cannot view or change any of the tuning parameters
• Customers can use Dynojet PV-3 or PV-4 devices to flash our provided DJT calibration file
◦ Customer should follow PV-3 or PV-4 instructions to flash
S&S Tune file
• DJT calibration file is software level 824. This is the latest version H-D has released for 2018-2020 Softail models. The stock calibration will be overwritten when new calibration for the MK136B is downloaded / install. This file covers oil cooled engines.
• 2021-up models require a different calibration. Further development is underway for calibration support on 2021-up bikes.
570-0075 Tune Software - 2018-2020 Softail Models (475 cam)
Download MK136B 475 Tune
MK136B (475) PDF Manual
Download 136B (475) PDF Manual
Year Group and Supported Combination
• 2018-2020 H-D M8 Softail Models
• PN 310-1295 MK136B Engine with 475 camshaft, Stock Throttle Body, and 5.5g injectors
• Exhaust - Stock H-D catalyst header with S&S GNX 4.5” mufflers
◦ DB inserts installed
• Air Cleaner - S&S Stealth with stock or +1 air filter
• Run this specified combination to be emissions compliant
◦ Deviation from specified setup may result in improper engine performance and in which case S&S is not liable for technical support or troubleshooting.
