Harley Screamin' Eagle Piston Kit 4.310" Bore x 4.5" Stroke 2017-25 Touring,ST
Part number 21900099 a Screamin' Eagle High Compression Piston Kit from Harley-Davidson, designed for use in the 131CI Stage IV performance upgrades for Milwaukee-Eight engines.
Product Details
The kit is a key component of the largest displacement bolt-on engine upgrade offered by Harley-Davidson, providing significant gains in torque and horsepower when installed as part of a complete Stage IV kit.
Bore and Stroke: 4.310" bore x 4.5" stroke.
Material: Forged from high-strength aluminum.
Design: Features precision-machined, coated skirts for a tight tolerance fit and quieter operation. The piston design and rings are engineered to withstand increased combustion forces.
Kit Contents: Includes two pistons, rings, wrist pins, and clips.
Legal Status: These are 50-State U.S. EPA compliant for sale and use on all applicable
Fitments
The Screamin' Eagle part number 21900099 high-compression piston kit is a replacement part for Milwaukee-Eight engines that have been upgraded with a 131CI Stage IV performance kit.
Compatible Models
The pistons fit specific Harley-Davidson models that are already running the 131 cubic inch (4.310" bore x 4.5" stroke) Stage IV engine upgrade:
Touring Models: Fits 2017–2025 Harley-Davidson Touring models equipped with 131CI Stage IV kits.
Excludes: 2023-later Center Cooled Touring models.
Excludes: Trike models.
Softail Models: Fits 2018–2024 Harley-Davidson Softail models equipped with 131CI Stage IV kits.
Excludes: 2025-later Softail models.
Important Notes
Stage IV Requirement: This kit is designed as a replacement specifically for the 131CI Stage IV setup; it is not for use with 128CI or other kits.
Engine Control Module (ECM): All installations and replacements require an ECM calibration using a Screamin' Eagle Pro Street Tuner for proper operation.
Components: The kit is designed to work with other specific Screamin' Eagle components, such as the SE8-517 cam developed for these engines.
Selling as pictured.
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010826-JM7