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Harley SCREAMIN EAGLE 128 STAGE IV KIT Softail 92500094

Regular price $6,612.01 Sale


Go big or go home. With the largest displacement of any Harley-Davidson Stage Kit , this 107CI to 128CI Stage IV Kit is designed to deliver maximum horsepower ‐ all the way to the redline. Packaged with patent-protected cylinder technology , it allows for the largest bolt-on engine upgrade to any Milwaukee-Eight motor. Features new CNC-ported heads with 1mm bigger valves and fully machined combustion chambers. It's designed to run wide open at high-end RPMs and provide a significant boost of torque from cruising speed. You'll feel the difference as soon as you twist the throttle.

• Delivers increased response throughout the entire RPM range

• Provides thrilling acceleration when twisting the throttle

• Maintains flat torque curve from cruising RPM to redline

• Can be installed without removing the engine from chassis

• Includes CNC Ported Cylinder Head with CNC machined chamber and 1mm larger valves , 128 Stage IV Timer cover , SE8-517 High-Lift Cam , Forged High Compression Pistons

• Also includes High Performance Cam Bearing and High Performance Tappets , 4.31" Steel Sleeve Cylinders , 64mm Throttle Body and Cast Manifold , High Flow Injectors (5.5 g/sec)

• Pending 49-State U.S. EPA compliant Details


'18-later Softail® 107CI models. FXFB requires separate purchase of Screamin' Eagle Softail High Flow Exhaust P/N's 64900828 or 64900829. Requires separate purchase of Cam Drive Retention Kit P/N 25566-06. Installation may require Cam Spacer Kit P/N 25928-06. '18-'19 models require separate purchase of High-Capacity Oil Pump P/N 62400247. All models require ECM calibration with Screamin' Eagle Pro Street Tuner for proper installation. Does not fit California models.