Harley-Davidson Stage 2 Kit: What’s Included for 103, 114 and 117 Engines
For many Harley-Davidson riders, upgrading engine performance is part of the ownership experience. After installing intake and exhaust upgrades as part of a Stage 1 modification, many owners begin looking toward the next step: the Harley-Davidson Stage 2 kit.
Stage 2 upgrades focus primarily on improving the engine’s breathing and torque delivery through internal components, most notably the camshaft. Whether your bike is equipped with a 103, 114, or 117 engine, understanding what a Stage 2 kit includes can help you choose the right parts for your riding style and ensure compatibility with your model.
For riders maintaining or upgrading their motorcycles, knowing what these kits contain also makes it easier to identify the correct components when browsing OEM and aftermarket parts catalogues.
What Is a Harley-Davidson Stage 2 Upgrade?
A Stage 2 Harley-Davidson upgrade typically builds on a completed Stage 1 setup. While Stage 1 focuses on improving airflow through the intake and exhaust systems, Stage 2 targets the engine's internal tuning.
The key change comes from installing a performance camshaft, which alters valve timing to increase torque and overall engine responsiveness. Depending on the cam profile selected, riders may notice stronger low-end torque, improved mid-range power, or a broader power band.
For touring riders and long-distance enthusiasts, Stage 2 upgrades are often chosen to improve acceleration when carrying luggage or riding two-up.
Main Components Included in a Stage 2 Kit
A standard Harley-Davidson Stage 2 kit typically includes several core components designed to work together. While exact contents may vary depending on the manufacturer or engine platform, most kits include:
Performance Camshaft
The camshaft is the central component of a Stage 2 upgrade. It controls how and when the engine valves open and close, directly influencing airflow and combustion efficiency.
Different cam profiles are available for different riding styles. Some prioritize low-end torque for city riding, while others are tuned for stronger mid-range power suitable for highway cruising.
Cam Installation Kit
Many Stage 2 kits include installation components required when replacing the camshaft. These can include bearings, gaskets, and related hardware needed for proper installation.
Depending on the engine family, additional components such as pushrods or lifters may also be recommended.
ECM Calibration or Tuning Support
Because a camshaft upgrade changes engine airflow characteristics, the engine control module (ECM) often requires recalibration. This ensures that fuel delivery and ignition timing remain optimized for the new setup.
Proper tuning allows the engine to operate smoothly and helps maintain reliability after performance modifications.
Stage 2 Kits for Harley-Davidson 103 Engines
The Twin Cam 103 engine remains a popular platform among Harley-Davidson riders, particularly on Touring and Softail models produced in the 2010s.
A Stage 2 kit for the 103 engine typically includes a camshaft designed to increase torque and improve throttle response. Many riders choose torque-oriented cam profiles that enhance performance during everyday riding conditions, especially at lower RPM ranges.
When upgrading a 103 engine, it is important to verify compatibility with your specific model year and engine configuration.
Stage 2 Upgrades for Milwaukee-Eight 114 Engines
The Milwaukee-Eight 114 engine introduced a new architecture for Harley-Davidson powertrains, offering improved cooling and efficiency compared to previous generations.
A Stage 2 kit for the 114 engine usually includes a camshaft optimized for the Milwaukee-Eight platform. These cams are designed to improve mid-range performance and provide stronger acceleration, particularly on heavier Touring motorcycles.
Because the Milwaukee-Eight engine uses a different internal design than the Twin Cam platform, the required installation parts and tuning process may differ.
Stage 2 Options for Harley-Davidson 117 Engines
The 117 engine, commonly found in CVO and performance-oriented models, already offers strong factory output. However, a Stage 2 upgrade for a 117 engine can further refine power delivery.
Camshaft upgrades for the 117 engine are chosen to increase torque across the RPM range while maintaining smooth quality. Riders looking to enhance highway performance or improve passing power frequently consider this upgrade.
Choosing the Right Stage 2 Kit
Before installing a Harley-Davidson Stage 2 kit, riders should confirm compatibility with their specific model, engine size, and year of production. Camshaft profiles and installation components can vary between platforms such as Twin Cam and Milwaukee-Eight engines.
For those searching for compatible components, Legendary Parts offers a wide range of OEM and aftermarket Harley-Davidson parts, including engine components, camshafts, and installation hardware. With new arrivals regularly added to the catalogue, riders can continue to build and maintain their motorcycles with parts suited to their performance goals.
Whether upgrading a 103, 114, or 117 engine, understanding the structure of a Stage 2 kit helps riders make informed decisions. It ensures that each modification supports the performance and reliability expected from a Harley-Davidson motorcycle.