Engine Performance Upgrades

Here at Richardson's H-D® we have a highly skilled team of technicians who can complete performance upgrades on your Harley-Davidson^®, ranging from a simple air cleaner and pipes upgrade to a full engine performance upgrades.

A Screamin’ Eagle® Performance Upgrade dials up the acceleration, torque, power and sound to a whole new level. Get ready to unlock the full potential of your HOG® with up to 40% gain in performance when fitting a Stage IV upgrade, but let us help you make the right choice!

Check out the factory performance stage and upgrade kits to take your motorcycle to the next level.

STAGE I: EXHAUST + INTAKE + TUNING

"I want simple bolt-on performance upgrades that enchance the performance, look and sound of my motorcycle"

STAGE I BENEFITS:

A stage 1 upgrade is ideal for riders who want to enhance the performance, look and sound of their motorcycle. This is the most cost-effective step to improve performance and is a required step for future performance upgrades.

After the tune, it allows more Air and Fuel to move through the engine for better performance, this step is the foundation for all future stage upgrades. 

STAGE I PERFORMANCE

The rider will feel up to a 10%* increase in performance when compared to stock bikes throughout the entire RPM range.

STAGE II: STAGE I + CAM UPGRADE

STAGE II BENEFITS:

Customers have a choice of a TORQUE CAM or POWER CAM based on their riding style, while adding style they have the choice of Black or Chrome pushrod covers. 

A performance cam increases both the lift in the valve train (pushing the valve open farther) and the duration of the valve opening (how long the valve stays open).

STAGE II PERFORMANCE:

TORQUE KIT: "I want instant power to pass at crusing and highway speeds"

The rider will feel up to a 15%* increase in performance when compared to stock bikes in the low to mid RPM range. Experience responsive throttle and acceleration that can be felt at slower speeds, perfect for passing slow-moving vehicles without downshifting.

POWER KIT: "I want to feel the power build and then pull all the way to the redline"

The rider will feel up to a 25%* increase in performance when comparing to stock bikes in the mid to upper RPM range. Experience the rush with the burst of speed while heading toward the redline. 

STAGE III: STAGE II + BIG BORE CYLINDERS + PISTONS

"I want instant power that lasts throughout the entire RPM Range. Bigger is better"

STAGE III BENEFITS:

Ideal for riders who want the largest engine displacement and increased power throughout the entire RPM range. An increase in engine displacement allows the engine to swallow more air and fuel, while a higher-compression piston squeezes the air and fuel into a more volatile mixture, generating more power when ignited.

Displacement increases are accomplished with larger cylinders, matching pistons and the proper cam upgrade.

A Stage III upgrade kit can take your standard 114C.I. or 117C.I. to a 122C.I. or if you own a 107C.I. to a 119C.I., giving your Harley-Davidson® a significant boost in performance.

STAGE IV: STAGE III + CYLINDERS HEADS + THROTTLE BODY

"I ride hard and want the absolute best performance upgrade available. Try to keep up... I dare you!"

STAGE IV BENEFITS:

Ideal for riders who want the absolute best Harley-Davidson® performance upgrade available. The Stage IV upgrade provides the highest-level performance upgrade available to provide a maximum increase in displacement, compression and flow. Higher-flowing CNC ported cylinder heads and larger bore throttle body increase the velocity and feed large volumes of air and fuel into the engine, which maximizes power on a larger displacement engine.

Combines ported cylinder heads and larger throttle body in combination with cylinders, matching pistons and proper cam upgrade.

The final step in making your Harley-Davidson® the performance machine of your dreams the Stage IV upgrade kit takes a standard 114C.I. or 117C.I. to a mighty 131C.I. or if you have a 107C.I. boosting it to a 128C.I. giving you that extra punch for peak performance.

Tuning: Required Recalibration for all Stages

All Screamin' Eagle performance upgrades require Engine Control Module (ECM) recalibration, also known as tuning.  The best method for tuning your stage upgrades is with the Screamin' Eagle Pro Street Tuner and Smart Tune PRO.

1. PRO STREET TUNER - Manual Adjustment
   1. Offers base calibrations for your chosen Screamin' Eagle stage upgrade
   2. Constantly monitors the engine operation in the Part Throttle Cruising Range
   3. Enables MANUAL adjustments to fine-tune parameters within part and full throttle ranges
2. SMART TUNE PRO - Automatic Adjustment
   1. Builds off of the Pro Street Tuner and its base calibrations as a starting point
   2. Constantly monitors the engine operation and riding conditions in the Complete Motorcycle Operating Range
   3. AUTOMATICALLY adjusts tuning parameters in REAL-TIME within the Complete Motorcycle Operating Range

*For specific performance results refer to the Screamin’ Eagle® Parts & Accessories Catalogue. Declared performance values represent SAE J-1349 transient peak power output. Dynamometer settings, motorcycle condition, variation, climate and other factors can affect performance output and can vary from the performance values declared by Harley-Davidson®.

Screamin' Eagle Milwaukee-Eight Engine 131 Performance Crate Engine

Built from the bottom up in Milwaukee, this street-tuned 131-cubic-inch Screamin' Eagle Crate Engine is designed to run with a wide open throttle at high engine speeds and provide instant passing power from cruising speed.  Made for riders seeking maximum displacement, compression and flow, it delivers 131 ft-lb of torque to the rear wheel as soon as the throttle is cranked.  Stage IV equipped engine includes 131 Stage IV badging on the cylinder heads and timer cover to highlight the powerplant. Ready for bolt-in installation in the Original Equipment-style chassis of your Touring bike.* No special fabrication or engine-mount relocation is required.

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