Hey guys! Today, we're diving deep into the world of the Polaris Sportsman 850, a beast of an ATV that's known for its power and versatility. Whether you're a seasoned rider or just starting out, this machine has a lot to offer. But like any piece of equipment, it has its quirks and things you should be aware of. So, let's get right into it and explore everything you need to know about the Polaris Sportsman 850. From common problems to performance upgrades, we've got you covered!

What is the Polaris Sportsman 850?

The Polaris Sportsman 850 is a high-performance all-terrain vehicle (ATV) designed for both recreational riding and utility work. It's part of the Sportsman lineup, known for its robust build and powerful engine. This ATV is built to handle various terrains, from muddy trails to rocky paths, making it a favorite among outdoor enthusiasts. The Sportsman 850 typically features a liquid-cooled, fuel-injected engine, providing reliable power and performance. It also comes with features like independent rear suspension (IRS) for a smooth ride, electronic power steering (EPS) for easier handling, and on-demand all-wheel drive (AWD) for superior traction. The Polaris Sportsman 850 isn't just about power; it also focuses on rider comfort and convenience. Many models include comfortable seating, ample storage, and intuitive controls. Whether you're using it for work around the farm, tackling challenging trails, or simply enjoying a weekend adventure, the Sportsman 850 is designed to deliver a top-notch experience. Plus, with a wide range of available accessories and upgrades, you can customize your Sportsman 850 to perfectly suit your needs and preferences.

Common Problems with the Polaris Sportsman 850

Alright, let's talk about some of the common issues you might encounter with your Polaris Sportsman 850. Knowing these beforehand can save you a lot of headaches down the road. No machine is perfect, and the Sportsman 850 has a few potential problem areas that owners should be aware of. Addressing these issues promptly can prevent more significant damage and keep your ATV running smoothly for years to come.

Electrical Issues

One of the most frequently reported problems involves the electrical system. This can range from a dead battery to faulty wiring. Sometimes, the battery doesn't hold a charge, especially in colder weather, which can be a real pain when you're trying to get your ride started. Another common issue is with the voltage regulator, which can fail and cause the battery to overcharge or undercharge. This can lead to further damage to the electrical components. Wiring problems, such as corroded or loose connections, can also cause various electrical malfunctions. To mitigate these issues, regularly inspect your battery terminals and wiring for corrosion or damage. Using a battery tender during periods of inactivity can help maintain the battery's health and ensure it's ready when you need it. If you notice any unusual electrical behavior, like flickering lights or a non-responsive starter, it's best to have it checked by a professional technician. Keeping your electrical system in good shape is crucial for the overall performance and reliability of your Sportsman 850.

Fuel System Problems

Fuel system issues can also plague the Polaris Sportsman 850. A common complaint is related to the fuel pump, which can fail over time, leading to poor engine performance or difficulty starting. Fuel injectors can also become clogged, especially if the ATV sits for extended periods without use. This can result in a rough idle, reduced power, and decreased fuel efficiency. Additionally, the fuel filter can become dirty, restricting fuel flow and causing similar symptoms. To prevent fuel system problems, it's essential to use high-quality fuel and add a fuel stabilizer if you plan to store your ATV for an extended period. Regularly inspecting and replacing the fuel filter can also help maintain optimal fuel flow. If you suspect a fuel system issue, such as difficulty starting, stalling, or poor performance, it's best to have it diagnosed by a qualified mechanic. Proper maintenance of the fuel system can ensure your Sportsman 850 runs smoothly and efficiently.

Suspension Issues

Suspension problems are another area to watch out for. The independent rear suspension (IRS) is great for a smooth ride, but it can also be a source of trouble. Bushings and bearings in the suspension components can wear out over time, leading to excessive play and a noisy ride. Shock absorbers can also lose their damping ability, resulting in a bouncy and uncomfortable experience. Additionally, the suspension springs can sag or break, especially if you frequently carry heavy loads or ride on rough terrain. To prolong the life of your suspension components, regularly inspect them for wear and tear. Lubricate the bushings and bearings as recommended in the owner's manual. If you notice excessive play, noise, or a significant decrease in ride quality, it's time to replace the worn components. Upgrading to heavy-duty suspension components can also improve performance and durability, especially if you frequently ride in challenging conditions. Keeping your suspension system in good condition will ensure a comfortable and controlled ride on your Sportsman 850.

Overheating

Overheating can be a significant concern, especially during hot weather or when working the ATV hard. The cooling system relies on a radiator, coolant, and fan to regulate engine temperature. If the radiator becomes clogged with mud or debris, it can restrict airflow and cause the engine to overheat. Low coolant levels or a malfunctioning thermostat can also lead to overheating. Additionally, a faulty cooling fan can prevent proper heat dissipation. To prevent overheating, regularly clean the radiator fins to ensure good airflow. Check the coolant level and top it off as needed. Inspect the thermostat and cooling fan for proper operation. If you notice the engine temperature rising above normal, stop and allow the engine to cool down before continuing. Addressing overheating issues promptly can prevent serious engine damage and keep your Sportsman 850 running reliably.

Clutch Problems

Clutch issues are relatively common, particularly in models with a belt-driven CVT transmission. The clutch system is responsible for transferring power from the engine to the wheels, and it can experience wear and tear over time. Belt slippage is a frequent problem, which can result in reduced power and acceleration. Clutch wear can also lead to jerky engagement and poor performance. Additionally, the clutch springs and weights can wear out, affecting the clutch's ability to properly engage and disengage. To minimize clutch problems, avoid excessive wheelspin and high-speed starts, as these can accelerate wear on the clutch components. Regularly inspect the clutch belt for signs of wear, such as cracks or fraying. Replace the belt as needed, following the manufacturer's recommendations. If you notice any unusual clutch behavior, such as slippage or jerky engagement, it's best to have it inspected by a qualified technician. Proper maintenance of the clutch system can ensure smooth and reliable power delivery from your Sportsman 850.

Polaris Sportsman 850 Specs

Let's get down to the nitty-gritty! Here are the key specifications you should know about the Polaris Sportsman 850.

• Engine: 850cc, liquid-cooled, fuel-injected twin-cylinder
• Horsepower: Around 78 hp
• Transmission: Automatic CVT with high and low range, reverse, and park
• Drive System: On-demand true AWD/2WD
• Suspension: Dual A-arm front suspension with IRS (Independent Rear Suspension)
• Brakes: Hydraulic disc brakes on all four wheels
• Fuel Capacity: Approximately 5.25 gallons
• Dry Weight: Around 779 lbs (varies by model)
• Ground Clearance: About 11.5 inches
• Towing Capacity: Roughly 1,500 lbs

These specs make the Sportsman 850 a powerhouse on the trails and a capable workhorse for various tasks. The combination of a powerful engine, versatile transmission, and robust suspension system ensures it can handle a wide range of conditions and challenges. Whether you're climbing steep hills, navigating rocky terrain, or hauling heavy loads, the Sportsman 850 is designed to deliver the performance and reliability you need.

Performance Upgrades for Your Polaris Sportsman 850

Want to take your Sportsman 850 to the next level? Here are some popular performance upgrades that can enhance its capabilities and make your riding experience even better.

Exhaust Systems

Upgrading your exhaust system can improve engine performance by increasing exhaust flow and reducing backpressure. Aftermarket exhaust systems often offer a more aggressive sound and can add a few extra horsepower. Popular brands include Two Brothers Racing, HMF, and SLP. When choosing an exhaust system, consider the type of riding you do. A full system typically provides the most significant performance gains, while a slip-on muffler is a more budget-friendly option that still offers some improvement. Be sure to check local regulations regarding exhaust noise levels to ensure your new exhaust system is compliant.

ECU Tuners

ECU (Engine Control Unit) tuners allow you to remap the engine's fuel and ignition curves, optimizing performance for different riding conditions and modifications. Products like the Dynojet Power Commander and HMF Optimizer are popular choices. These tuners can improve throttle response, increase horsepower, and fine-tune the engine for optimal fuel efficiency. When using an ECU tuner, it's essential to follow the manufacturer's instructions carefully and choose a map that is appropriate for your specific setup. A professional dyno tune can also help you get the most out of your ECU tuner and ensure your engine is running safely and efficiently.

Suspension Upgrades

Upgrading your suspension can significantly improve ride quality and handling, especially if you frequently ride on rough terrain. Options include aftermarket shocks, springs, and complete suspension kits from brands like Elka Suspension and Fox Racing. Upgraded shocks offer better damping control and can be adjusted to suit your riding style and load. Heavier springs can improve stability and prevent bottoming out when carrying heavy loads or riding aggressively. A complete suspension kit can provide a comprehensive upgrade, improving overall performance and handling. When choosing suspension upgrades, consider the type of riding you do and your budget. Investing in high-quality suspension components can make a noticeable difference in your riding experience.

Tires and Wheels

The tires and wheels you choose can have a significant impact on your ATV's performance and handling. Upgrading to a more aggressive tire tread pattern can improve traction in mud, sand, and other challenging terrains. Lightweight wheels can reduce unsprung weight, improving acceleration and handling. Popular tire brands include Maxxis, ITP, and STI. When choosing tires and wheels, consider the type of riding you do and the terrain you typically encounter. Wider tires provide better stability, while taller tires can increase ground clearance. Be sure to choose tires and wheels that are compatible with your ATV's specifications and local regulations.

Clutch Kits

Clutch kits can improve the performance of your CVT transmission, providing better acceleration, backshifting, and overall responsiveness. These kits typically include new clutch weights, springs, and sometimes a new belt. They are designed to optimize the clutch engagement and shift characteristics for different riding conditions and modifications. Popular brands include Dalton Industries and EPI Performance. When choosing a clutch kit, consider the type of riding you do and the modifications you have made to your ATV. A properly tuned clutch kit can make a noticeable difference in your ATV's performance and drivability.

Maintenance Tips for Your Polaris Sportsman 850

Keeping your Polaris Sportsman 850 in top shape requires regular maintenance. Here are some essential maintenance tips to keep your ATV running smoothly for years to come.

• Regular Oil Changes: Change the engine oil and filter according to the manufacturer's recommendations (usually every 25 hours of use or every six months).
• Air Filter Maintenance: Clean or replace the air filter regularly, especially if you ride in dusty conditions.
• Coolant Checks: Check the coolant level regularly and top it off as needed. Flush and replace the coolant every two years.
• Brake Inspections: Inspect the brake pads and rotors regularly for wear. Replace them as needed.
• Tire Pressure: Maintain proper tire pressure for optimal handling and tire life.
• Lubrication: Lubricate all moving parts, such as suspension components and control cables, regularly.
• Battery Maintenance: Keep the battery terminals clean and use a battery tender during periods of inactivity.
• Fuel System Care: Use high-quality fuel and add a fuel stabilizer if you plan to store your ATV for an extended period.
• Inspect and Tighten: Regularly inspect all nuts and bolts and tighten them as needed.

Conclusion

The Polaris Sportsman 850 is a fantastic ATV that offers a blend of power, versatility, and comfort. While it has its share of potential issues, with proper maintenance and timely repairs, it can provide years of reliable service. And with the right performance upgrades, you can customize it to perfectly suit your needs and riding style. Whether you're hitting the trails or tackling tough jobs, the Sportsman 850 is a solid choice. So, keep these tips in mind, and happy riding!