S&S Cycle MK136 M8 Crate Engine for 2017-2025 Oil-Cooled Harley-Davidson Touring
When your oil-cooled Touring model is ready for a transformation rather than another tune-up, the S&S Cycle MK136 Black Edition delivers exactly that. It installs in place of your factory engine and immediately changes what your Harley feels like under power – more authority at every throttle position, more pull on long stretches, and a powertrain that finally feels worthy of the chassis.
Key Features
- 136ci (2229cc) M8-based crate engine built around a gear-drive cam system for precise valve timing and proven reliability
- Black Edition finish with Black Edition cylinder heads and cases
- Available with 475G cam for 49-state street compliance or 550G cam for maximum output (race/track use)
- Direct replacement for 2017-Up oil-cooled Harley-Davidson Touring factory M8 engine – uses existing mounting points
- Backed by S&S Cycle with a one-year parts warranty and full technical support
Technical Specifications
- Displacement: 136ci (2229cc)
- Engine Architecture: Milwaukee-Eight based, air-cooled (oil-cooled)
- Cam Drive: Gear drive
- Finish: Black Edition
- Cam Options: 475G (49-state compliant, 2017-2023 Touring) or 550G (race only, 2017-Up Touring)
- Warranty: One-year S&S Cycle parts warranty
Fitment Notes
- 475G cam version: 49-state street legal compliance for 2017-2023 oil-cooled Touring models; not approved for California
- 550G cam version: race/track use only; not street legal; fits 2017-Up oil-cooled Touring models
- Requires oil-cooled M8 Touring chassis – not compatible with twin-cooled or water-cooled configurations
- A fuel tuner is required for proper calibration after installation; not included
- Review the Fitment tab for complete year and model breakdown
