K&N KN-171B Oil Filter – Black (Replaces H-D® 63731-99A & 63798-99) 🖤🏍️

Take your Harley-Davidson® or Buell® to the next level with the K&N KN-171B Oil Filter – Black (Replaces H-D® 63731-99A & 63798-99). Built for high-performance filtration and maximum oil flow, this premium Powersports filter delivers consistent pressure, leak-free protection, and a tough black finish that perfectly complements blacked-out engine builds.

The Breakdown
🖤 Durable Black Finish – Corrosion-resistant and built to match custom blacked-out bikes.
⚙️ High-Flow Premium Media – Traps contaminants efficiently while maintaining unrestricted oil flow.
🔩 17mm Removal Nut – Allows for fast, easy filter changes with standard tools.
💧 Anti-Drainback Valve – Prevents dry starts and protects engine components (where applicable).
🛡️ Bypass & PSI Relief Valve – Maintains stable oil pressure at all RPMs.
🧱 Nitrile Rubber Gasket – Provides a tight, leak-free seal for long-term reliability.
📏 Dimensions – Height: 3.70” | OD: 2.91” | Thread: 3/4"-16 UNF | Weight: 0.8 lb.
🏍️ Direct Replacement for H-D® 63731-99A & 63798-99 – Fits Harley-Davidson® and Buell® models with no modifications required.

Vehicle Fitment
✔ Harley-Davidson® FLD, FLDE Deluxe, FLFB Fat Boy, FLH Electra Glide, FLHR Road King, FLHX Street Glide, FXBB Street Bob, FXBRS Breakout, FXLR Low Rider, FXST Softail Standard, FXDWG Dyna Wide Glide, and more.
✔ Buell® M2 Cyclone, S1 Lightning, X1 Lightning, and S3 Thunderbolt.

Reliable, road-ready, and built to perform—the K&N KN-171B Oil Filter – Black (Replaces H-D® 63731-99A & 63798-99) keeps your motor clean and your style sharp.