Harley-Davidson® Performance & Dyno 

As a Harley-Davidson® rider, you expect the highest level output from your motorcycle motor. Luckily, you're already equipped with the industry-leading Milwaukee-Eight® engine. However, customized performance can help solidify the connection between bike and biker. As you know, it's hard to get accustomed to a motorcycle that feels off. It's an imbalance of expectation, riding style, and much more. Getting your bike's specs calibrated to your liking is key to finding harmony between you and your ride.

At High Country Harley-Davidson®, we pride ourselves in fine-tuning the hardware to be more uniquely you. Motorcycle engines are at the forefront of performance—upgrading them is crucial in tailoring your bike to your standards. At the end of the day, professional motorcycle engine service is what's going to get the job done. You won't be leaving your bike in inexperienced hands, though. Our Screamin' Eagle® performance experts are certified through world-class training and are supplied with state-of-the-art tools. Altogether, we have over 120 years of collective experience guiding our staff. You can rest assured knowing our motorcycle engine maintenance is first-class and will bring an extra boost to your ride. Visit us in Cheyenne, Wyoming or Frederick, Colorado today! We'll transform your Harley-Davidson's® engine to suit your style.


Moving more air and fuel through your Harley-Davidson® engine is the easiest (and most cost effective) way to create more horsepower and torque. A free-flowing air cleaner and matching tuned exhaust will add performance you can feel. To optimize engine performance (and to minimize the risk of engine damage), any changes to the intake and exhaust system must be accompanied by an increase in fuel flow.


Developed specifically for fuel-injected Harley-Davidson® motorcycles, Screamin’ Eagle® EFI Stage Kits offer complete street-legal performance configurations engineered to help you generate specific torque and horsepower gains at a given engine calibration. Eliminating all the guesswork and trial-and-error testing normally associated with engine modifications, Stage Kits include everything you need to enhance your bike’s performance.


Camshafts are a fundamental ingredient in the performance recipe, because they control the timing and duration of all major engine events. They are the primary means by which you can tune your engine’s horsepower and torque output. Every cam has unique lift and overlap performance characteristics, which means you need to select cams based on exactly the kind of power you’re looking for. If you need increased torque to launch a heavy bike off the line, or high horsepower to improve trap speed with a lightweight bike, Screamin’ Eagle® cams are available in a wide variety of configurations engineered to help you achieve the results you crave.


Once you’ve increased your engine’s displacement, you need to select complementary components that provide an ideal compression ratio for your specific situation. You can actually increase engine power solely by boosting the compression ratio — the amount of pressure resulting from “squeezing” the air/fuel mixture — inside the cylinder’s combustion chamber. The shape of the combustion chamber, which is dictated by the design of the cylinder heads and pistons, also has an effect on how efficiently the air/fuel mixture is drawn into the cylinder, burned and then expelled.