Let's dive into the world of the Honda CB400 Super Four, a bike that has captured the hearts of riders for decades. Guys, if you're thinking about giving your CB400 a personal touch, you've come to the right place. We're going to explore everything about modifying this iconic machine, from simple tweaks to full-blown transformations. So, buckle up and let's get started!

Why Modify a Honda CB400 Super Four?

Modifying a Honda CB400 Super Four isn't just about aesthetics; it's about making the bike truly yours. The CB400 is renowned for its reliability, smooth engine, and comfortable riding position. However, its classic design leaves plenty of room for customization. Whether you're aiming for a cafe racer, a streetfighter, or simply want to enhance its performance, the CB400 is a fantastic platform.

One of the primary reasons people modify their CB400s is to improve performance. While the stock CB400 is a capable machine, there's always room for improvement. Upgrading the exhaust system, for instance, can boost horsepower and torque, while also giving the bike a more aggressive sound. Air intake modifications, such as installing a high-flow air filter, can further enhance engine performance by allowing it to breathe more freely. Many riders also opt to re-jet their carburetors or remap their fuel injection system to optimize the air-fuel mixture for the modified components. These performance enhancements can significantly improve acceleration, throttle response, and overall riding experience.

Another popular reason for modifying a CB400 is to enhance its handling and ride quality. Upgrading the suspension components, such as installing aftermarket shocks and fork springs, can dramatically improve the bike's stability and cornering ability. Adjustable suspension systems allow riders to fine-tune the damping and preload to suit their riding style and road conditions. Additionally, some riders choose to install steering dampers to reduce handlebar wobble and improve stability at high speeds. Upgrading the brakes with stainless steel brake lines and performance brake pads can also improve stopping power and braking feel, enhancing overall safety and confidence on the road. These modifications not only improve the bike's performance but also make it more comfortable and enjoyable to ride.

Aesthetic modifications are perhaps the most common reason for customizing a CB400. The classic and timeless design of the CB400 provides a blank canvas for riders to express their personal style and creativity. Common aesthetic modifications include changing the paint scheme, adding custom graphics, and installing aftermarket bodywork such as fairings, fenders, and seat cowls. Many riders also opt to replace the stock handlebars with clip-ons or aftermarket handlebars to achieve a more aggressive or comfortable riding position. Upgrading the lighting with LED headlights, taillights, and turn signals can improve visibility and add a modern touch to the bike's appearance. Custom seats, mirrors, and license plate brackets are also popular choices for riders looking to personalize their CB400 and make it stand out from the crowd. These aesthetic modifications not only enhance the bike's visual appeal but also reflect the rider's individuality and passion for motorcycling.

Popular CB400 Modification Styles

When it comes to CB400 modification styles, the possibilities are endless. But some styles are more popular than others. Let's take a look at a few of the most common:

Cafe Racer

The cafe racer style is all about stripping the bike down to its essentials and giving it a classic, minimalist look. Think clip-on handlebars, a humped seat, and a minimalist fairing. Cafe racer modifications often include removing unnecessary components like the stock airbox and replacing them with pod filters. The exhaust is typically upgraded to a free-flowing system, and the rear frame is often modified to accommodate the new seat. The overall goal is to create a lightweight, agile machine that looks as good as it performs.

Creating a cafe racer from a CB400 involves several key modifications. The first step is often to replace the stock handlebars with clip-ons, which provide a lower and more aggressive riding position. This requires careful adjustment of the controls and cables to ensure they function properly. Next, the seat is typically replaced with a humped cafe racer seat, which not only improves the bike's aesthetics but also provides better support for the rider. The rear frame may need to be modified to accommodate the new seat, which can involve cutting and welding the frame to achieve the desired look. The stock airbox is often removed and replaced with pod filters, which improves airflow to the engine but may require re-jetting the carburetors to ensure proper fuel mixture. The exhaust system is typically upgraded to a free-flowing system, which not only improves performance but also enhances the bike's sound. Finally, the bike is often stripped of any unnecessary components, such as the passenger footpegs and bulky fenders, to achieve a minimalist and lightweight appearance.

Streetfighter

Streetfighter builds are aggressive and in-your-face. This style emphasizes raw power and edgy aesthetics. Common modifications include removing the fairings, installing a high-mounted exhaust, and adding a more aggressive headlight. Streetfighters often feature upgraded suspension components and brakes to handle the increased power and aggressive riding style. The overall look is one of brutal functionality and undeniable attitude. Streetfighter modifications are all about making a statement and showcasing the bike's performance capabilities.

Transforming a CB400 into a streetfighter involves several distinctive modifications. The most noticeable change is the removal of the fairings, which exposes the bike's mechanical components and gives it a raw, aggressive look. The headlight is typically replaced with a smaller, more modern unit, such as a projector or LED headlight, which improves visibility and adds to the bike's streetfighter aesthetic. The exhaust system is often upgraded to a high-mounted system, which not only improves performance but also enhances the bike's visual appeal. The handlebars are typically replaced with wider, more aggressive handlebars, which provide better control and leverage. Upgrading the suspension components and brakes is also common, as streetfighters are often ridden hard and need to be able to handle the increased power and aggressive riding style. Finally, the bike is often customized with aftermarket accessories such as bar-end mirrors, frame sliders, and a custom paint job to complete the streetfighter look.

Bobber

Bobbers are all about simplicity and classic style. This style typically involves removing any unnecessary components, such as the front fender and passenger seat. The rear fender is often chopped short, and the bike is given a low, lean look. Bobber modifications often include replacing the stock wheels with spoked wheels and adding whitewall tires. The overall goal is to create a minimalist, vintage-inspired machine that oozes cool.

Converting a CB400 into a bobber requires a focus on simplicity and vintage aesthetics. The first step is often to remove any unnecessary components, such as the front fender, passenger seat, and bulky turn signals. The rear fender is typically chopped short to create a minimalist look, and the bike is often given a low, lean stance by lowering the suspension or using shorter shocks. Replacing the stock wheels with spoked wheels and adding whitewall tires is a common modification that enhances the bike's vintage appeal. The seat is typically replaced with a solo seat, which adds to the bike's minimalist look and provides a more comfortable riding position. The handlebars are often replaced with ape hangers or other custom handlebars that complement the bike's bobber style. Finally, the bike is often customized with vintage-inspired accessories such as a vintage headlight, taillight, and license plate bracket to complete the bobber transformation.

Essential Modifications

Okay, so you've got a style in mind. Now, what are some essential modifications you should consider?

Exhaust System

Upgrading the exhaust system is one of the most popular modifications for the CB400. A good aftermarket exhaust can improve horsepower, torque, and sound. Look for a system that's designed specifically for the CB400 to ensure proper fitment and performance. Full systems are generally more expensive but offer the best performance gains, while slip-on mufflers are a more affordable option that still provides a noticeable improvement in sound and aesthetics.

Choosing the right exhaust system for your CB400 involves considering several factors. Full exhaust systems typically replace the entire exhaust system from the engine to the muffler, while slip-on mufflers only replace the muffler. Full systems generally offer better performance gains because they are designed to optimize exhaust flow from the engine, but they are also more expensive and require more installation work. Slip-on mufflers are a more affordable option that still provides a noticeable improvement in sound and aesthetics, and they are easier to install. When choosing an exhaust system, it's important to consider the material, such as stainless steel or titanium, as well as the design and sound level. Some exhaust systems are louder than others, so it's important to choose one that complies with local noise regulations and suits your personal preferences.

Suspension

The stock suspension on the CB400 is decent, but it can be significantly improved with aftermarket components. Upgrading the fork springs and shocks will improve handling and ride quality, especially if you're planning on riding aggressively or carrying a passenger. Adjustable suspension components allow you to fine-tune the bike's handling to your specific needs and preferences.

Upgrading the suspension on your CB400 can dramatically improve its handling and ride quality. Aftermarket fork springs and shocks are designed to provide better damping and support, which improves the bike's stability and cornering ability. Adjustable suspension components allow you to fine-tune the damping and preload to suit your riding style and road conditions. When choosing suspension components, it's important to consider the spring rate, damping characteristics, and adjustability. Some suspension systems are designed for aggressive riding, while others are designed for comfort and touring. It's also important to choose suspension components that are compatible with your bike's year and model to ensure proper fitment and performance.

Brakes

Upgrading the brakes is a must if you're planning on increasing the bike's performance. Stainless steel brake lines and performance brake pads will improve stopping power and brake feel. Consider upgrading the master cylinder and calipers for even more braking performance.

Enhancing the braking system on your CB400 is crucial for improving safety and confidence on the road. Stainless steel brake lines replace the stock rubber brake lines, which can expand under pressure and reduce braking performance. Stainless steel brake lines provide a more direct and consistent braking feel, which improves stopping power and control. Performance brake pads offer better friction and heat resistance than stock brake pads, which improves braking performance in both wet and dry conditions. Upgrading the master cylinder and calipers can further enhance braking performance by providing more clamping force and better modulation. When choosing brake components, it's important to consider the compatibility with your bike's year and model, as well as the intended use. Some brake components are designed for street riding, while others are designed for track use.

Tips for a Successful Modification

Before you start wrenching, here are a few tips for a successful modification:

• Do Your Research: Before you buy any parts, make sure they're compatible with your bike and that they'll achieve the look and performance you're after.
• Plan Your Build: It's easy to get carried away with modifications. Plan your build carefully to ensure that all the parts work together and that the final result is cohesive.
• Take Your Time: Don't rush the process. Take your time to do the job right, and don't be afraid to ask for help if you get stuck.
• Safety First: Always prioritize safety when working on your bike. Use the proper tools and equipment, and wear appropriate safety gear.

Conclusion

Modifying a Honda CB400 Super Four is a rewarding experience that allows you to create a bike that's truly your own. Whether you're aiming for a cafe racer, a streetfighter, or something else entirely, the CB400 is a versatile platform that can be transformed into almost anything you can imagine. So, get out there, get wrenching, and create the bike of your dreams!