Description
High-RPM hydraulic tappet systems become a liability on seriously built engines—they fail under sustained boost and load, leaving you stranded at the track. The JIMS Hydrosolid Tappet XL 1803 solves this by functioning as a true hydraulic unit up to 5500 rpm, then transitioning to solid operation at higher speeds, eliminating pump failure while unlocking 3–6 additional usable horsepower. If you’re pushing your Sportster XL hard, this is the failsafe upgrade that pays for itself in performance.
- Hydraulic tappet operation: 0–5500 RPM
- Solid tappet mode: 5500+ RPM
- Power gain: 3–6 horsepower
- Eliminates hydraulic pump failure
- USA manufactured
- Fitment: Harley Sportster 1991–1999
- Requires adjustable pushrods
- Installation: Bolt-on with setup
- Application: High-performance engines
