Hey guys! Let's dive into the nitty-gritty details of the 2004 Polaris Sportsman 400. This ATV was a workhorse back in its day, and many are still kicking around, offering reliable performance for various tasks. Whether you're considering buying one, need to maintain your current ride, or are just curious about its capabilities, this guide covers everything you need to know about the 2004 Polaris Sportsman 400 specs. We'll explore engine specifics, dimensions, suspension, and more, providing a comprehensive overview to keep you informed.

Engine and Performance

The heart of the 2004 Polaris Sportsman 400 is its robust engine, which delivers a blend of power and reliability that made it a popular choice among ATV enthusiasts. The engine type is a 4-stroke, single-cylinder, liquid-cooled powerhouse. Liquid cooling is critical because it helps maintain consistent operating temperatures, preventing overheating during tough rides and ensuring longevity. The engine displacement is approximately 425cc, providing ample torque and horsepower for both recreational and utility purposes. With a carburetor fuel system, the engine delivers smooth and responsive throttle control, making it easy to handle in various terrains. The carburetor ensures that the engine receives the correct air-fuel mixture, optimizing combustion and performance. The engine is designed to produce around 30 horsepower, which is more than enough for tackling trails, hauling loads, or navigating through challenging landscapes. The engine's performance is further enhanced by its smooth power delivery, making it suitable for both beginners and experienced riders. The engine's design also contributes to its durability, with robust components built to withstand the rigors of off-road use. Regular maintenance, such as oil changes and filter replacements, will ensure that the engine continues to perform optimally for years to come. The liquid cooling system requires periodic checks to ensure that coolant levels are adequate and that there are no leaks. By understanding the engine's specifications and maintenance requirements, you can keep your 2004 Polaris Sportsman 400 running strong and reliably. The engine's overall design reflects Polaris' commitment to providing a durable and capable ATV that meets the needs of a wide range of users. So, whether you're using it for work or play, the engine of the 2004 Sportsman 400 is up to the task.

Dimensions and Weight

Understanding the dimensions and weight of the 2004 Polaris Sportsman 400 is crucial for several reasons. These specs affect handling, stability, and transportability. The overall length of the ATV is approximately 81 inches, providing a good balance between maneuverability and stability. The width is around 46 inches, which allows it to navigate through tight trails while still offering a stable platform. The height, measured to the handlebars, is about 47 inches, ensuring a comfortable riding position for most adults. The wheelbase, the distance between the front and rear axles, is approximately 50.5 inches. This contributes to the ATV's stability and helps it maintain a smooth ride over rough terrain. The ground clearance is around 9.5 inches, which is quite respectable and allows it to clear obstacles without getting hung up. This is particularly useful when riding in wooded areas or rocky landscapes. The dry weight of the 2004 Polaris Sportsman 400 is approximately 680 pounds. This weight provides stability and helps keep the ATV planted on the ground, especially when navigating uneven terrain. However, it's important to consider this weight when transporting the ATV, as it will affect the type of trailer or vehicle needed. Knowing the dimensions is also helpful for storage purposes, ensuring that it fits in your garage or shed. The weight distribution is well-balanced, contributing to its predictable handling and making it easier to control. The combination of these dimensions and weight makes the 2004 Polaris Sportsman 400 a versatile ATV suitable for a variety of tasks and terrains. Whether you're using it for work around the farm or exploring off-road trails, these specifications play a key role in its overall performance and usability. So, keep these measurements in mind when evaluating its suitability for your needs.

Suspension and Brakes

The suspension and braking systems on the 2004 Polaris Sportsman 400 are designed to provide a comfortable ride and reliable stopping power, enhancing both safety and performance. The front suspension features MacPherson struts with approximately 8.2 inches of travel. MacPherson struts are a common choice for ATVs because they offer a good balance of simplicity, durability, and performance. The 8.2 inches of travel allows the front wheels to absorb bumps and dips in the trail, providing a smoother ride and better control. The rear suspension utilizes a fully independent, progressive rate suspension with approximately 9.5 inches of travel. This independent rear suspension (IRS) is a significant advantage because it allows each rear wheel to move independently, maintaining better contact with the ground and improving traction. The progressive rate suspension means that the suspension becomes stiffer as it compresses, preventing bottoming out during hard impacts. This setup provides a comfortable ride while also offering excellent handling and stability. The braking system consists of hydraulic disc brakes on both the front and rear wheels. Hydraulic disc brakes provide strong and consistent stopping power, even in wet or muddy conditions. The front brakes are controlled by a hand lever, while the rear brakes are controlled by a foot pedal. This dual-brake system allows the rider to independently control the front and rear brakes, providing greater control and flexibility. The brakes are designed to be durable and reliable, requiring minimal maintenance. Regular inspections and brake pad replacements are essential to ensure optimal performance. The combination of the MacPherson strut front suspension, independent rear suspension, and hydraulic disc brakes makes the 2004 Polaris Sportsman 400 a capable and comfortable ATV for a wide range of riding conditions. Whether you're navigating rough trails or working on the farm, these systems work together to provide a smooth, controlled, and safe riding experience. Understanding the specifications of these systems can help you appreciate the engineering that went into this ATV and ensure that you maintain them properly for years of reliable service.

Tires and Wheels

The tires and wheels on the 2004 Polaris Sportsman 400 are designed to provide optimal traction, stability, and durability for a variety of terrains. The stock tires are typically sized at 25x8-12 for the front and 25x11-12 for the rear. These tire sizes offer a good balance between maneuverability and traction, making the ATV suitable for both trail riding and utility tasks. The front tires are narrower to provide precise steering and control, while the rear tires are wider to deliver maximum traction and stability. The tires feature a versatile tread pattern that performs well in various conditions, including mud, dirt, and gravel. The tread pattern is designed to provide good grip while also allowing for self-cleaning, preventing the tires from becoming clogged with debris. The wheels are typically made of steel or aluminum, depending on the specific model and trim level. Steel wheels are more durable and resistant to damage, while aluminum wheels are lighter and can improve handling. The wheels are designed to withstand the rigors of off-road use, providing reliable performance and longevity. The tire pressure should be regularly checked and maintained according to the manufacturer's recommendations. Proper tire pressure is essential for optimal traction, handling, and tire life. Overinflated tires can reduce traction and make the ride harsher, while underinflated tires can increase the risk of punctures and damage to the wheels. When replacing the tires, it's important to choose tires that are compatible with the ATV and suitable for the type of riding you'll be doing. There are many different types of ATV tires available, each designed for specific conditions and applications. The tires and wheels play a critical role in the overall performance and handling of the 2004 Polaris Sportsman 400. By understanding their specifications and maintaining them properly, you can ensure that your ATV delivers optimal performance and a safe, enjoyable riding experience. Whether you're navigating challenging trails or working on the farm, the right tires and wheels can make all the difference.

Electrical System

The electrical system of the 2004 Polaris Sportsman 400 is crucial for powering various components, including the starter, lights, and other accessories. The ATV is equipped with a 12-volt electrical system, which is standard for most ATVs. The system includes a battery, stator, regulator/rectifier, and various wiring harnesses. The battery provides the initial power to start the engine and operate the electrical components. It is typically a lead-acid battery that requires periodic maintenance, such as checking the fluid levels and cleaning the terminals. The stator is responsible for generating electricity while the engine is running. It is located inside the engine and is driven by the crankshaft. The regulator/rectifier converts the AC voltage produced by the stator into DC voltage and regulates the voltage to prevent overcharging the battery. The wiring harnesses connect all the electrical components together, providing a pathway for the electricity to flow. It is important to inspect the wiring harnesses regularly for any signs of damage or corrosion. The electrical system also includes various fuses and circuit breakers to protect the components from overloads and short circuits. If any of the electrical components are not working properly, it is important to check the fuses and circuit breakers first. The headlights and taillights are essential for safe riding, especially at night or in low-light conditions. The headlights provide illumination for the rider, while the taillights make the ATV visible to other vehicles. The starter motor is responsible for cranking the engine to start it. If the starter motor is not working properly, the engine may not start. The electrical system is a complex network of components that work together to provide power to the ATV. Regular maintenance and inspections are essential to ensure that the system is functioning properly and to prevent any potential problems. Understanding the basics of the electrical system can help you troubleshoot common issues and keep your 2004 Polaris Sportsman 400 running smoothly. Whether you're using it for work or play, a reliable electrical system is essential for a safe and enjoyable riding experience.

Conclusion

Alright, folks, that wraps up our deep dive into the specs of the 2004 Polaris Sportsman 400. Hopefully, this has given you a clearer picture of what this ATV brings to the table. From its engine and dimensions to its suspension, brakes, and electrical system, we've covered all the key aspects that make this model a reliable and versatile machine. Whether you're a seasoned ATV enthusiast or just getting started, understanding these specs can help you make informed decisions about maintenance, repairs, and upgrades. The 2004 Polaris Sportsman 400 remains a popular choice for its blend of power, durability, and affordability. Its robust engine and well-designed suspension make it capable of handling a variety of terrains and tasks. By keeping up with regular maintenance and addressing any issues promptly, you can ensure that your Sportsman 400 continues to provide years of reliable service. Thanks for tuning in, and happy riding!