Year-by-Year Guides
Major Changes by Generation
Important milestones.
Harley-validated
Timeline
- 1984: Evolution engine
- 1999: Twin Cam engine
- 2007: Twin Cam with hydraulic tensioner + 96ci
- 2014: Project Rushmore for Touring
- 2017: Milwaukee-Eight engine
- 2018: Unified M8 Softail platform
- 2021: Pan America (RevMax)
- 2021: Sportster S (RevMax)
Quick questions
Bad Harley years?
Twin Cam 1999-2006 (cam chain), 2014-2016 Touring (early water-cooled), M8 117 2018-2019 (oil pump).
Best years?
Late Evo (1996-1999), Twin Cam 2007-2013, M8 107 2017+.
Where to dig deeper
- NHTSA Recall lookup by VIN
- HDForums year-specific threads