HiFloFiltro HF171 RC Oil Filter for 1984-Up Harley-Davidson Big Twin and Sportster
The right oil filter does more than trap contaminants — and for Evolution and Sportster owners dealing with wet-sumping symptoms, the anti-drainback valve in the HF171 RC adds a layer of protection that the standard Evo and Sportster filter lacks. Built with race-proven tri-fiber media and a tool-friendly hex nut, the HF171 RC delivers professional-grade filtration across the full range of Harley-Davidson Big Twin and Sportster XL engines.
Key Features
- Advanced tri-fiber filtration media delivers higher filtration capacity and improved oil flow compared to standard filter media
- Heavy-duty steel canister with a pre-welded 17mm cross-drilled hex nut for tool-assisted removal and installation
- TÜV SÜD certified — the only motorcycle oil filter line to carry independent third-party quality certification
- Anti-drainback valve prevents filter drain-back on Evolution Big Twin and Sportster XL engines — a beneficial secondary check for owners experiencing wet-sumping caused by oil pump check valve wear
- Rubber-coated relief valve ensures a perfect seal during operation
- Fully compatible with all oil types — synthetic, semi-synthetic, and conventional
- Available in black or chrome to match your build
Technical Specifications
- Black Part Number: HF171BRC
- Chrome Part Number: HF171CRC
- Filtration Media: Tri-fiber high-flow performance media
- Removal Nut: 17mm pre-welded cross-drilled hex nut
- Thread: 3/4″-16 UNF
- Certification: TÜV SÜD
- Oil Type Compatibility: All oil types
- Finish Options: Black, Chrome
Fitment Notes
- Fits Evolution Big Twin engines (1984-1999) — the Evo oiling system does not require the anti-drainback valve, but provides a beneficial secondary barrier against drain-back on engines experiencing wet-sumping from oil pump check valve wear
- Fits all Twin Cam Big Twin models (1999-2017) across Touring, Dyna, Softail, and Trike platforms
- Fits all Milwaukee-Eight Big Twin models (2017-Present) across Touring and Softail platforms
- Fits Sportster XL 883 and 1200 models (1986-2022) — shares the same 3/4″-16 UNF thread as Big Twin models; anti-drainback valve is harmless to the Sportster oiling system and provides the same wet-sumping benefit
- Not compatible with Revolution Max platform models, including the 2021-Up Sportster S (RH1250S) and 2022-Up Nightster (RH975/RH975S) — these use a different engine architecture and filter specification
- Please review the Fitment tab for the complete year and model compatibility breakdown
