Hey guys! Today, we're diving deep into the heart of a beast – the 2020 Polaris Sportsman 850 motor. If you're an owner, a potential buyer, or just a curious gearhead, this is the place to be. We'll cover everything from its specs and performance to common issues and how to keep it running like a champ. So, buckle up and let's get started!

Overview of the 2020 Polaris Sportsman 850

Before we get into the nitty-gritty of the motor, let's take a quick look at the machine it powers. The Polaris Sportsman 850 is a legendary ATV known for its robust performance, impressive capabilities, and comfortable ride. It's a workhorse that can handle tough trails, heavy loads, and long days on the farm. And at the heart of it all is that powerful 850 motor.

The 2020 model year brought some refinements to the Sportsman 850, making it an even more compelling package. Polaris focused on improving the overall riding experience with features like enhanced suspension, improved ergonomics, and updated styling. But the core of its performance remains the same: that potent 850cc engine.

The Sportsman 850 isn't just about brute force; it's also about intelligent design. Features like electronic fuel injection (EFI) ensure smooth and reliable starting in all conditions. The on-demand all-wheel drive (AWD) system provides excellent traction when you need it, while the independent rear suspension (IRS) soaks up bumps and keeps the ride comfortable. Whether you're tackling a rocky trail or hauling firewood, the Sportsman 850 is up to the task.

This ATV is popular among a wide range of riders, from weekend warriors to serious outdoorsmen. Its versatility and reliability have made it a top choice in the ATV market. And with a strong aftermarket support network, you can easily customize your Sportsman 850 to suit your specific needs and preferences. Whether you're adding a winch for heavy-duty work or upgrading the suspension for more aggressive riding, the possibilities are endless.

The 2020 Polaris Sportsman 850 is more than just an ATV; it's a tool, a toy, and a reliable companion for all your outdoor adventures. Understanding its motor is key to appreciating its capabilities and keeping it running strong for years to come. So, let's dive deeper into the heart of this machine and explore the inner workings of the 850 motor.

Detailed Specifications of the 850 Motor

Okay, let's get down to the specifics. The 2020 Polaris Sportsman 850 motor is a liquid-cooled, 4-stroke twin-cylinder engine. This configuration provides a great balance of power and smoothness, making it ideal for a wide range of applications. Here's a breakdown of the key specs:

• Displacement: 850cc
• Engine Type: 4-Stroke Twin Cylinder
• Cooling: Liquid-Cooled
• Fuel System: Electronic Fuel Injection (EFI)
• Horsepower: Around 78 hp (This can vary slightly depending on the specific model and tuning)
• Bore x Stroke: 85 mm x 74 mm
• Compression Ratio: 10.5:1

The liquid-cooling system is essential for maintaining optimal engine temperature, especially during demanding conditions. This helps to prevent overheating and ensures consistent performance. The EFI system provides precise fuel delivery, resulting in improved throttle response, fuel efficiency, and easier starting, regardless of the ambient temperature.

The twin-cylinder design offers a significant advantage over single-cylinder engines in terms of smoothness and power delivery. The balanced firing order reduces vibrations, making for a more comfortable ride, while the increased displacement provides ample torque for tackling tough terrain and heavy loads. The 10.5:1 compression ratio contributes to the engine's strong performance and responsiveness.

Compared to other ATVs in its class, the Sportsman 850 boasts a competitive power-to-weight ratio. This means it can accelerate quickly and maintain speed even when carrying heavy loads or climbing steep hills. The engine's robust construction and durable components are designed to withstand the rigors of off-road use, ensuring long-term reliability.

Polaris has continuously refined the 850 motor over the years, incorporating advancements in engine technology to improve performance and efficiency. The 2020 model benefits from these improvements, offering a refined and powerful riding experience. Whether you're a seasoned rider or a beginner, you'll appreciate the engine's smooth power delivery and predictable handling.

The 850 motor is a testament to Polaris' commitment to engineering excellence. Its combination of power, reliability, and refinement makes it a standout in the ATV market. Understanding these specifications is crucial for maintaining your Sportsman 850 and ensuring it continues to perform at its best.

Common Problems and Issues with the 850 Motor

Alright, let's talk about the not-so-fun stuff. While the 2020 Polaris Sportsman 850 motor is generally reliable, like any machine, it can experience problems from time to time. Knowing about these potential issues can help you troubleshoot problems and keep your ATV in top shape.

• Fuel Pump Issues: Some owners have reported fuel pump failures, which can cause the engine to stall or not start at all. This is often due to debris in the fuel tank clogging the pump filter. Regular fuel filter maintenance can help prevent this issue.
• Overheating: While the liquid-cooling system is effective, overheating can still occur, especially during hot weather or when working the engine hard. Check the coolant level regularly and ensure the radiator is clean and free of debris.
• Stator Problems: The stator is responsible for charging the battery and powering the electrical system. Stator failures can lead to a dead battery and prevent the engine from starting. Symptoms include a weak battery, dim headlights, and difficulty starting the engine.
• Sensor Failures: Modern engines rely on various sensors to monitor engine performance. Faulty sensors can cause a variety of problems, such as poor fuel economy, rough idling, and reduced power. Common culprits include the oxygen sensor, throttle position sensor, and crankshaft position sensor.
• Exhaust Leaks: Exhaust leaks can reduce engine performance and cause excessive noise. Check the exhaust system regularly for cracks or loose connections.

It's important to note that these are just potential issues, and not every Sportsman 850 will experience them. However, being aware of these problems can help you catch them early and prevent them from becoming more serious. Regular maintenance, such as oil changes, air filter cleaning, and spark plug replacement, can go a long way in keeping your engine running smoothly.

If you do encounter a problem with your 850 motor, it's always a good idea to consult a qualified mechanic. They have the tools and expertise to diagnose and repair the issue correctly. Attempting to fix complex engine problems yourself without the proper knowledge can lead to further damage and costly repairs.

By being proactive about maintenance and addressing any potential issues promptly, you can help ensure the long-term reliability of your 2020 Polaris Sportsman 850 motor. A little preventative care can save you a lot of headaches down the road.

Performance Upgrades and Modifications

Want to take your 2020 Polaris Sportsman 850 motor to the next level? There are plenty of performance upgrades and modifications available to boost its power, improve its handling, and customize its appearance. Let's explore some popular options:

• Performance Exhaust Systems: Upgrading to a performance exhaust system can improve exhaust flow, resulting in increased horsepower and torque. These systems often feature lighter materials and less restrictive designs than the stock exhaust.
• ECU Tuning: Tuning the engine control unit (ECU) can optimize fuel delivery and ignition timing for improved performance. This can be done with aftermarket tuning devices or by a professional tuner.
• Air Intake Upgrades: Installing a high-flow air intake system can increase the amount of air entering the engine, resulting in improved throttle response and horsepower. These systems often feature larger air filters and less restrictive intake tubes.
• Clutch Kits: Upgrading the clutch can improve acceleration and low-end torque. Clutch kits typically include new springs and weights that are designed to optimize the clutch engagement for different riding conditions.
• Big Bore Kits: For serious performance enthusiasts, a big bore kit can increase the engine's displacement, resulting in a significant power boost. These kits typically include new cylinders, pistons, and other components.

Before making any modifications, it's important to consider the potential impact on reliability and warranty coverage. Some modifications may void your warranty or require additional maintenance. It's also a good idea to research the specific products you're considering and read reviews from other owners.

When choosing performance upgrades, it's important to select products that are compatible with your riding style and intended use. For example, if you primarily ride on trails, you may want to focus on upgrades that improve low-end torque and throttle response. If you're a more aggressive rider, you may want to consider upgrades that boost horsepower and top-end speed.

Modifying your Sportsman 850 can be a fun and rewarding experience, but it's important to do your research and make informed decisions. With the right upgrades, you can transform your ATV into a true performance machine.

Maintenance Tips for Long Motor Life

To ensure your 2020 Polaris Sportsman 850 motor has a long and healthy life, regular maintenance is essential. Here are some key maintenance tips to keep in mind:

• Regular Oil Changes: Changing the oil and filter at the recommended intervals is crucial for engine lubrication and preventing wear. Use a high-quality oil that meets Polaris' specifications.
• Air Filter Cleaning: A clean air filter is essential for preventing dirt and debris from entering the engine. Clean or replace the air filter regularly, especially if you ride in dusty conditions.
• Spark Plug Replacement: Replace the spark plugs at the recommended intervals to ensure proper ignition and engine performance.
• Coolant Flush: Flush the coolant system every two years to remove contaminants and prevent corrosion. Use a coolant that is compatible with your ATV's cooling system.
• Fuel Filter Replacement: Replace the fuel filter regularly to prevent debris from clogging the fuel system. This is especially important if you use low-quality fuel.
• Valve Adjustments: Check and adjust the valve clearances at the recommended intervals to ensure proper engine performance and prevent valve damage.

In addition to these routine maintenance tasks, it's also important to inspect your ATV regularly for any signs of wear or damage. Check the tires, brakes, suspension, and other components to ensure they are in good working order. Address any problems promptly to prevent them from becoming more serious.

Following these maintenance tips will help keep your 2020 Polaris Sportsman 850 motor running smoothly and reliably for years to come. A little preventative maintenance can save you a lot of time and money in the long run. So, take care of your machine, and it will take care of you!

Conclusion

The 2020 Polaris Sportsman 850 motor is a powerful and reliable engine that's at the heart of a legendary ATV. By understanding its specifications, potential issues, and maintenance requirements, you can keep your Sportsman 850 running strong for years to come. Whether you're a weekend warrior or a serious outdoorsman, taking care of your engine is essential for enjoying all that this amazing machine has to offer. So, get out there, explore the trails, and have fun – but don't forget to give your 850 motor the love and attention it deserves!