Horsepower Harley-Davidson

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Why Service your bike with us?

Horsepower Harley-Davidson® has full-time service personnel devoted to meeting all your motorcycling needs and V-Twin visions! Whether it's routine maintenance, a tire change or an electrical issue - we've got you covered. How about a Big-Bore kit for your Twin Cam 96®? The only limit to what we can do is your imagination. Our team of dedicated factory-trained professionals has over 50 years of combined technical and customer service experience. Open 5 days a week (Tuesday through Saturday), our state-of-the-art facility includes the latest "Harley-Davidson® Digital Technician II" for pinpoint diagnostics. We are a Power Commander Certified Tuning Center. We have technicians that are trained to tune H-D Race Tuner, Power Commander and have experience with many other aftermarket tuning devices.

The credibility of our Service Department is absolutely astounding. Specializing in stock and high performance Harley-Davidson, we are equipped to make your bike suitable for you and your taste. We have top factory-trained technicians on duty during all business hours.

We honor all warranty work and favor any recalls. We accommodate any type of problem that may arise with your Harley-Davidson® motorcycle in an efficient, precise, and timely manner.

Please call our Service Department at (570) 320-0630

Want warranty information? Looking for the best motorcycle warranty plan? Check out Harley-Davidson's® Extended Service Plan by asking our Service Advisor.

When you need service done right, and done now, don't look any further than our fully trained staff of Service Writers and Technicians.

Parts and Accessories

We use Genuine Harley-Davidson® parts and accessories. We have it all. Even those hard to find items. If we do not have it in stock, we will try to help you find it. Just ask! Everything from your heart's (or your bike's) desire in chrome accessories to stock and custom paint sets, hard and soft saddlebags, bike security as well as a large selection of Screamin' Eagle® Performance Parts.
We have everything to keep your bike looking good and running like a piece of Milwaukee Iron.

Come in and meet our friendly, knowledgeable staff. You will be glad you did. Our qualified staff is always ready to assist in making sure you get the right parts, for the right bike, at the right price. Our highly trained staff of professionals not only know about the parts they are selling, but also use them on their own bikes.

Horsepower Harley-Davidson is Central Pennsylvanias Premiere Authorized Simoniz Mototect Dealer for Sales & Installation on all New Motorcycles.

Simoniz MotoTect is a new protectant designed to maintain the exterior of your motorcycle.

• Utilizes exclusive Simoniz GlassCoat ceramic resin technology
• GlassCoat is not a wax or polish! But a permanent coating!
• Protects your motorcycle’s paint from acid rain, tree sap, bird waste, insects, UV damage
• Covers your seat against staining, cracking and fading
• Provides outstanding long-term shine and protection
• Is available only through Authorized New Motorcycle Dealerships

Need Help?

Call our service department at 570-320-0630.

Horsepower Harley-Davidson® Dyno Services

Dyno Tuning - "Feel the Difference" therapy for your motorcycle!!!


A Dynamometer is essential to realizing the full potential of today's fuel injected and carbureted motorcycles with performance modifications. This is the only tool that can accurately calibrate fuel and ignition maps or diagnose run/drivability issues in a controlled environment. We have technicians that are trained to tune H-D Race Tuner, Power Commander (Horsepower Harley-Davidson is a certified Dynojet tuning center) and have experience with many other aftermarket tuning devices.

Now equipped with Real time Torque module/meter, real time O2 and Eddy current load control, our Dynamometer is a state of the art, computer controlled, Dynojet® 200. By simulating the best "seat-of-the-pants" road testing right in the shop, many drivability/run problems can be diagnosed in a fraction of the time.


Understanding fuel and ignition requirements

The simplest way to look at the internal combustion engine and understand what is done to increase performance is to see it as an air pump. The more air it is capable of pumping at any given time, the more power it will make (expressed as Volumetric Efficiency or VE). To get the most energy out of that air, it relies on accurate metering of fuel to that air (expressed as stoichiometric, an AFR of 14.7:1 is the theoretical ratio that results in the greatest release of available energy in gasoline). Real world inefficiencies result in an air/fuel ratio (AFR) of 12.8:1 to 13.3:1, for best power and 14.5:1, for best mileage. Keeping the AFR around 13.8 under load, get the best of both worlds.

The VE, AFR and tuning requirements constantly vary as determined by the mechanical and dynamic properties of the motor. The main mechanical parts are typically engine size (volume), compression ratio/cylinder pressure (static, corrected and dynamic), cam timing/lift, port/valve flow capacity (cfm, including the induction system), exhaust and NOS/super/turbo charging.
The exhaust system is the largest, single, variable influence on how the motor processes air, the shape of the VE graph and tuning requirements. The dynamic parts are typically RPM, throttle position and load (including wind, tire pressure, terrain, gearing and luggage).

Ignition requirements are dictated by engine design properties such as exhaust (how much heat is retained), cam profiles, piston/combustion chamber shape, piston/head clearance (quench/squish), cylinder pressures, rpm limits, fuel quality and intended use.

On carbureted motorcycles to adjust air/fuel ratios. We use various performance parts and kits. To install we remove the carburetors to gain access to and replace pilot jets, main jets, emulsion tubes, needles and make float height adjustments as required.

This procedure can require removing and replacing the carburetors many times until the correct ratios are accomplished. A dyno tune is the most efficient and accurate method.

Fuel Injected Motorcycles have throttle bodies and fuel injectors driven by the ECU (engine control unit) and its programming or calibration. Input from a variety on sensors allows more accurate control as engine demands change and offsets to account for environment changes.

Race Tuner®

The Screamin' Eagle® Race Tuner allows direct access to the ECU programs and their modification. We are, in affect, creating custom calibrations for specific combinations (just like H-D reflash cartridges). The Race Tuner does, however include many SE calibrations in the map files to select from. These can then be modified or a completely new file created if the combination does not match the calibrations part description.

Race Tuner provides a much higher level of tuning than any other device without replacing the ECU itself. Each cylinders fuel and ignition mapping is independently tuned, using three dimensions, resulting in a custom map that eliminates the possibility of one cylinder fighting or holding back the other.

This equals more horsepower with smooth linear drivability. In addition, warm up enrichment, idle speeds, IAC steps, rev limits, AFR offsets, injector sizing can be changed. To help in tuning or diagnostics, Race Tuner also features a data mode to collect and review sensor inputs or other data. Both of these can only be tuned accurately by using a Computer controlled load cell dyno with real time AFR monitoring.

We can custom build a Fuel Injection Map just for your bike!




Call us at (570) 320-0630 or email us at  •  All Rights Reserved Horsepower Harley-Davidson ©2011
Horsepower Harley-Davidson, Inc • 1910 East 3rd Street • Williamsport, PA 17701