When riding a motorcycle, being heard is just as important as being seen. Most factory-installed motorcycle horns are small disc horns that produce a quiet, high-pitched sound often drowned out by traffic noise or car audio systems. A motorcycle air horn is a popular aftermarket upgrade that provides a significantly louder and deeper sound, ensuring that other drivers are aware of your presence. This article explains the benefits of air horns, the different types available, and how to choose and install the right one for your bike.
Why Consider a Motorcycle Air Horn?
Safety is the primary reason most riders choose to install an air horn. A standard motorcycle horn typically produces between 80 and 100 decibels, which can be difficult to hear from inside a modern, sound-insulated car. In contrast, many motorcycle air horns produce between 110 and 140 decibels.
This increase in volume can make a life-saving difference in emergency situations. When a driver begins to merge into your lane without looking, a loud air horn provides an immediate, unmistakable warning. Because air horns often have a deeper tone, they also sound more like a car or truck horn, which tends to command more attention from other motorists.
Types of Motorcycle Air Horns
There are two main designs for motorcycle air horns. Understanding the difference between them will help you determine which model fits your motorcycle and your mechanical skill level.
Compact Integrated Air Horns
Compact air horns combine the air compressor and the acoustic horn (the trumpet) into a single, relatively small unit. These are the most popular choice for motorcycles because they are easier to mount in limited space. Because the compressor is attached directly to the horn, there is no need for air hoses, which simplifies the installation process.
Split or Dual-Unit Air Horns
Split systems separate the compressor from the horn unit, connecting them with a flexible plastic air hose. This design is ideal for motorcycles with very little open space. You can mount the bulky compressor under the seat or behind a fairing while placing the smaller horn unit in a more visible or audible location. While more versatile, these systems require a bit more effort to install due to the routing of the air lines.
Key Features to Look For
When shopping for a motorcycle air horn, several factors should influence your decision. It is important to balance sound output with the physical constraints of your motorcycle.
- Decibel Rating: Look for a horn rated at least 110dB. Keep in mind that decibels are measured on a logarithmic scale, meaning a 130dB horn is significantly louder than a 120dB horn.
- Weather Resistance: Motorcycles are exposed to rain, dust, and vibration. Ensure the horn you choose is rated for outdoor use and features a durable housing to protect the internal compressor.
- Power Draw: Air horns require more electricity than stock horns. Most motorcycles use a 12-volt system, but you must ensure your battery and charging system can handle the momentary high current draw.
- Size and Fitment: Measure the area where your current horn is located. Ensure the new air horn will not interfere with the movement of the forks, the heat of the engine, or the aerodynamics of the fairings.
Understanding the Importance of a Relay
One of the most critical aspects of installing an air horn is using a relay. A relay is an electromagnetic switch that allows a low-current circuit (your factory horn button) to control a high-current circuit (the new air horn compressor).
Most factory horn wiring is not designed to carry the high amperage required by an air compressor. If you connect an air horn directly to your factory wires, you risk blowing a fuse or damaging the horn switch on your handlebars. Most high-quality air horn kits include a relay and a wiring diagram to ensure a safe installation.
Step-by-Step Installation Guide
While every motorcycle is different, the general process for installing an air horn follows a standard set of steps. Always consult your specific product manual before beginning the work.
1. Prepare Your Tools and Workspace
You will typically need a set of wrenches or sockets, wire strippers, crimping tools, and electrical tape or heat-shrink tubing. Ensure the motorcycle is on a stable stand and the engine is cool.
2. Disconnect the Battery
Before touching any electrical components, disconnect the negative (black) terminal of your battery. This prevents accidental short circuits while you are working with the wiring.
3. Remove the Old Horn
Locate your factory horn and disconnect the two wires leading to it. Unscrew the mounting bolt and remove the old unit. Keep the mounting hardware, as you may be able to reuse it for the new horn bracket.
4. Mount the New Air Horn
Find a secure location for the new horn. If using an integrated unit, ensure the “trumpet” opening faces slightly downward. This prevents water from pooling inside the horn, which could damage the internal components over time.
5. Wire the Relay
Follow the wiring diagram provided with your kit. A standard 4-pin relay installation usually looks like this:
- Pin 85 and 86: Connect these to the two original wires that went to your factory horn. It does not matter which wire goes to which pin.
- Pin 30: Connect this directly to the positive (+) terminal of your battery using a fused wire.
- Pin 87: Connect this to the positive terminal on the air horn compressor.
- Ground: Connect the negative terminal of the air horn compressor to a clean metal part of the motorcycle frame or directly to the negative (-) battery terminal.
6. Test the System
Reconnect your battery and turn the ignition to the “on” position. Press the horn button briefly to ensure it functions. If the horn makes a clicking sound but no air noise, double-check your ground connections and battery voltage.
Maintenance and Care
To keep your air horn functioning reliably, perform basic maintenance during your regular bike inspections. Check the mounting bolts to ensure they haven’t vibrated loose. Inspect the wiring for any signs of fraying or corrosion at the terminals.
If you have a split system, check the air hose for kinks or cracks. If the horn sound becomes muffled, check the trumpet opening for debris like mud or insects. Keeping the unit clean and dry will extend the life of the compressor significantly.
Legal Considerations
While air horns are legal in most jurisdictions, some areas have specific regulations regarding maximum decibel levels for road vehicles. Generally, as long as the horn is used for safety and not for harassment, you will not encounter legal issues. Always use your horn responsibly and only when necessary to alert others of your presence or an impending hazard.
Conclusion
Upgrading to a motorcycle air horn is one of the most effective ways to improve your safety on the road. By replacing a weak factory horn with a powerful, attention-grabbing air horn, you ensure that you can communicate effectively with other drivers in high-stakes situations. Whether you choose a compact unit for ease of installation or a split system for a custom fit, the added peace of mind is well worth the effort.
For more tips on maintaining your bike or improving your riding experience, explore our other articles on motorcycle safety gear and basic mechanical maintenance at SearchAndHelp.com.