Kawasaki KX85 Supermoto: The Ultimate Guide

Hey guys! Thinking about turning your Kawasaki KX85 into a Supermoto beast? You've come to the right place. This guide dives deep into everything you need to know about building a killer KX85 Supermoto, from essential modifications to performance upgrades. Let's get started!

What is a Supermoto?

Before we jump in, let's quickly cover what Supermoto is all about. Supermoto bikes are essentially dirt bikes that have been modified for street and track use. They typically feature smaller wheels (usually 17-inch), street tires, and upgraded brakes. This combination makes them incredibly agile and fun to ride on paved surfaces. Supermoto bikes are known for their ability to tackle tight corners and perform impressive slides, making them a popular choice for both racing and recreational riding.

Why a KX85 Supermoto?

The Kawasaki KX85 is a fantastic platform for building a Supermoto. Here's why:

• Lightweight and Agile: The KX85 is naturally lightweight, making it incredibly nimble and responsive. This is a huge advantage on a Supermoto track or tight city streets.
• Powerful Two-Stroke Engine: The KX85's two-stroke engine packs a serious punch for its size. With the right modifications, you can extract even more power and torque, making it a thrilling ride.
• Affordable: Compared to larger displacement bikes, the KX85 is relatively affordable, both to purchase and to modify. This makes it a great option for riders on a budget.
• Fun Factor: Let's be honest, riding a Supermoto is just plain fun! The KX85's playful handling and punchy engine make it a blast to ride, whether you're carving up corners or pulling off wheelies.

Essential Modifications for Your KX85 Supermoto

Okay, so you're convinced that a KX85 Supermoto is the way to go. Now, let's talk about the essential modifications you'll need to make.

1. Wheels and Tires

This is the most crucial modification. You'll need to swap out the stock dirt bike wheels for 17-inch Supermoto wheels. These wheels are designed to accommodate street tires, which provide much better grip on pavement. When choosing wheels, consider factors such as weight, durability, and style. Common materials include aluminum and carbon fiber, with aluminum being a more budget-friendly option. Also, selecting the right tires is super important. Look for tires that are specifically designed for Supermoto use, as they offer the optimal balance of grip and durability. Popular brands include Dunlop, Michelin, and Pirelli.

It's important to make sure that the tire size you choose fits your wheels and your bike's frame without any rubbing. Consult with a professional mechanic or experienced Supermoto rider for guidance on choosing the right wheel and tire combination for your KX85. The improved handling and grip provided by Supermoto wheels and tires will dramatically transform your riding experience, allowing you to confidently attack corners and push your bike to its limits. Upgrading to Supermoto wheels and tires is really where the Supermoto transformation begins, setting the stage for all the other performance and aesthetic improvements you'll make along the way.

2. Brakes

Supermoto riding puts a lot of stress on your brakes, so upgrading them is a must. Consider installing a larger front rotor and a more powerful brake caliper. This will provide you with significantly more stopping power and better brake feel. Steel braided brake lines are also a worthwhile upgrade, as they reduce brake line expansion and provide a more consistent brake feel. Many riders opt for radial-mounted calipers for even greater braking performance. Brands like Brembo and Beringer are known for producing high-quality Supermoto brake components. The improved braking performance will allow you to brake later and harder, giving you a competitive edge on the track and increasing your safety on the street. Don't skimp on brakes; they are one of the most important safety features on your bike. Investing in high-quality brakes will not only improve your performance but also give you the confidence to push your limits knowing you can stop quickly and safely.

3. Suspension

The KX85's stock suspension is designed for off-road use, so it will be too soft for Supermoto riding. You'll need to stiffen up the suspension to prevent excessive dive under braking and improve handling. This can be achieved by installing stiffer springs and re-valving the suspension. Alternatively, you can upgrade to aftermarket Supermoto-specific suspension components. Companies like Ohlins and Race Tech offer a wide range of suspension upgrades for the KX85. Properly tuned suspension will dramatically improve your bike's handling and stability, allowing you to corner faster and with more confidence. Investing in suspension upgrades tailored to Supermoto riding will make a noticeable difference in your bike's performance and overall riding experience. Properly dialed-in suspension will keep your tires planted and improve traction, allowing you to maintain control and confidently navigate any corner or obstacle.

4. Gearing

The stock gearing on the KX85 is designed for dirt riding, which means it's too short for Supermoto use. You'll need to change the gearing to achieve a higher top speed and better acceleration on pavement. Experiment with different sprocket combinations to find what works best for your riding style and the tracks you ride. A common starting point is to increase the size of the front sprocket or decrease the size of the rear sprocket. Keep in mind that changing the gearing will affect your bike's acceleration and top speed, so it's important to find a balance that suits your needs. Adjusting your gearing can dramatically impact your bike's performance, making it crucial to experiment and find the ideal setup. Fine-tuning your gearing will optimize your bike's acceleration and top speed, allowing you to maximize its potential on the track or street.

5. Supermoto Bodywork (Optional)

While not strictly necessary, Supermoto bodywork can enhance the look of your KX85 and provide additional protection. Supermoto bodywork typically includes a front fender, handguards, and crash sliders. These components can help protect your bike in the event of a crash and give it a more aggressive, Supermoto-inspired look. Many riders also opt for custom graphics kits to personalize their bikes. Supermoto bodywork is mostly an aesthetic enhancement, but it can also offer practical benefits in terms of protection. Upgrading the bodywork is also an expression of personal style, allowing you to create a bike that truly reflects your personality and taste. While Supermoto bodywork isn't essential for performance, it can add a touch of style and protection to your KX85 Supermoto. If you are looking to turn heads as well as performance, this upgrade is an option for you.

Performance Upgrades for Your KX85 Supermoto

Once you've addressed the essential modifications, you can start thinking about performance upgrades to further enhance your KX85 Supermoto.

1. Engine Modifications

The KX85's two-stroke engine responds well to modifications. Some popular engine upgrades include:

• Porting and Polishing: Optimizing the cylinder head for improved airflow.
• High-Compression Cylinder Head: Increasing compression for more power.
• Aftermarket Exhaust: Improving exhaust flow for increased horsepower.
• Carburetor Modifications: Fine-tuning the carburetor for optimal fuel delivery.

These modifications can significantly increase your engine's power output and improve its overall performance. However, it's important to note that engine modifications can also decrease reliability, so it's crucial to choose reputable parts and have the work done by a qualified mechanic. If you're looking to squeeze every last bit of power out of your KX85, engine modifications are the way to go. Engine modifications can transform your KX85 into a real powerhouse, delivering thrilling acceleration and impressive top-end speed.

2. Clutch Upgrades

A stronger clutch is a must if you're planning on making significant engine modifications. An upgraded clutch will be able to handle the increased power and torque, preventing slippage and ensuring consistent performance. Look for a clutch kit that includes heavier-duty springs and friction plates. Upgrading your clutch is a smart investment if you're planning on increasing your engine's power output. An upgraded clutch will provide improved reliability and performance, ensuring that you can confidently put the power to the ground.

3. Data Acquisition

For serious racers, data acquisition systems can provide valuable insights into your bike's performance. These systems record data such as speed, RPM, throttle position, and brake pressure, allowing you to analyze your riding and identify areas for improvement. Data acquisition can be a valuable tool for improving your lap times and fine-tuning your bike's setup. While data acquisition may seem like an advanced modification, it can provide a competitive edge by helping you optimize your riding and bike setup.

Tips for Riding Your KX85 Supermoto

Okay, so you've built your dream KX85 Supermoto. Now, let's talk about how to ride it!

• Body Position: Use your body weight to lean into corners and maintain balance.
• Braking Technique: Use a combination of front and rear brakes, and practice threshold braking to avoid locking up the wheels.
• Throttle Control: Be smooth and precise with the throttle to maintain traction and avoid wheelspin.
• Sliding: Practice controlled slides to help you navigate tight corners.
• Practice Makes Perfect: The more you ride, the better you'll become. Find a local Supermoto track or practice area and get some seat time.

Is a KX85 Supermoto Street Legal?

This is a tricky question, as it depends on your local laws and regulations. In many areas, it is difficult or impossible to make a KX85 street legal due to its lack of required equipment such as lights, turn signals, and a speedometer. However, some states have more lenient laws regarding modified motorcycles. Check your local DMV regulations to determine the legality of riding a KX85 Supermoto on the street. It's essential to be aware of the legal implications of riding a modified motorcycle on public roads. Before hitting the streets, make sure your KX85 Supermoto is legal in your area to avoid any potential fines or legal issues.

Conclusion

Building a Kawasaki KX85 Supermoto can be a rewarding and exciting project. With the right modifications and a bit of practice, you can transform your dirt bike into a pavement-shredding machine. So, what are you waiting for? Get out there and start building your dream KX85 Supermoto today! Remember to always ride safely and responsibly. Have fun, guys!