Hey guys, if you're here, chances are you're either a proud owner of a 2015 Polaris Sportsman 850 or you're considering buying one. Well, you've come to the right place! We're going to dive deep into some of the common issues that these ATVs sometimes face and, more importantly, how you can tackle them. Knowing about potential problems beforehand can save you a whole lot of headaches down the road. So, let's get started and make sure your off-roading adventures are as smooth as possible!

Engine and Performance Woes

Alright, let's kick things off with what's under the hood – the engine! The 2015 Polaris Sportsman 850 packs a punch with its powerful engine, but sometimes, even the best machines can run into a few snags. One of the most frequently reported issues revolves around engine performance. This could show up in a few different ways, like the ATV losing power, running rough, or even stalling unexpectedly. This can be super frustrating, especially when you're out on the trails. Several things can cause these engine performance problems, and we will check out some of the most common ones.

Firstly, fuel-related issues are often to blame. This includes problems with the fuel pump, fuel injectors, or even contaminated fuel. A clogged fuel filter, for example, can restrict the amount of fuel reaching the engine, leading to a lack of power or stalling. You should always make sure you're using fresh, high-quality fuel and that your fuel filter is in good shape. Regularly inspecting and replacing the fuel filter as needed can go a long way in preventing these types of issues.

Then there's the electronic throttle control (ETC) system. The ETC is designed to manage the engine's throttle response, and if something goes wrong with it, you might experience issues such as a jerky throttle or inconsistent power delivery. In this case, it's best to have a certified mechanic take a look and diagnose the problem using the diagnostic tool.

Another culprit can be the spark plugs. Faulty or worn-out spark plugs can cause misfires, leading to rough engine operation and poor performance. Regularly checking and replacing your spark plugs is a simple but important maintenance task. Also, make sure that your air filter is clean and properly installed, as a dirty or poorly sealed air filter can allow dirt and debris to enter the engine, causing damage and performance issues. Always check for any vacuum leaks in the system, which can cause the engine to run lean and have performance issues.

Electrical System Troubles

Okay, let's move on to the electrical system. Electrical gremlins can be the bane of any ATV owner's existence. The 2015 Polaris Sportsman 850 is no exception, and there are a few common electrical issues that you should be aware of. One of the most frequently reported issues is related to the starting system. This can manifest as the ATV not starting, or starting but then dying soon after.

One common cause of starting problems is a faulty battery. It's always a good idea to start by checking your battery voltage. A weak or dead battery won't provide enough power to crank the engine. In fact, if your battery is more than a few years old, it might be time to replace it. Also, make sure that the battery terminals are clean and free of corrosion.

Then, there's the starter itself. The starter motor can sometimes fail, preventing the engine from turning over. If you hear a clicking sound when you try to start the ATV, but the engine doesn't crank, the starter might be the culprit. You can try to test the starter by jumping it directly, or you can take it to a mechanic for a diagnosis.

Another issue to consider is the wiring harness. Loose connections or damaged wires can cause all sorts of electrical problems. Check the wiring harness for any signs of damage, such as frayed wires or loose connectors. It's also important to inspect the ground wires, which can corrode over time and cause problems.

Then there are the fuses. Make sure to check the fuses in the fuse box. A blown fuse can prevent various electrical components from working properly. Always use the correct amperage fuse, and never replace a fuse with one that has a higher rating.

Clutch and Transmission Problems

Alright, let's get into the clutch and transmission – these are critical components for transferring power from the engine to the wheels. Issues in this area can lead to a variety of problems, from a loss of power to complete failure to move. One of the most frequently reported problems is clutch-related. This can range from slipping clutches to premature wear. The clutch in the 2015 Polaris Sportsman 850 is designed to handle a lot of torque, but it can still wear out over time, especially with aggressive riding or heavy use.

Slipping clutches often exhibit symptoms like a loss of power, especially when accelerating, or the engine revving higher than usual without a corresponding increase in speed. If you suspect your clutch is slipping, it's important to have it inspected and replace it if necessary. Worn-out clutch components can lead to further damage and costly repairs down the road.

Another issue to be aware of is transmission problems. While not as common as clutch problems, they can still occur. Transmission issues can manifest as difficulty shifting gears, jumping out of gear, or even complete transmission failure. Transmission problems can be caused by various factors, including worn gears, damaged bearings, or low or contaminated transmission fluid.

Regular maintenance is key to preventing clutch and transmission issues. Make sure to keep the transmission fluid changed as recommended in your owner's manual. Inspect the clutch components periodically for wear, and replace them as needed. If you notice any unusual noises or difficulty shifting gears, it's best to have your ATV inspected by a qualified mechanic.

Suspension and Steering Issues

Let's talk about the suspension and steering system. These are critical for handling and rider comfort, especially when you're tackling challenging trails. One common area of concern is suspension-related issues. The 2015 Polaris Sportsman 850 has a sophisticated suspension system designed to absorb bumps and provide a smooth ride. However, over time, components can wear out or fail.

Shock absorbers can lose their effectiveness, leading to a bouncy or harsh ride. If you notice that your ATV is bottoming out easily or that the ride quality has deteriorated, it might be time to replace your shocks. Also, check the shock seals for any leaks.

Another issue to consider is suspension bushings. Bushings are used to connect the suspension components, and they can wear out over time, leading to play in the suspension and a loss of stability. Check the bushings for wear and tear, and replace them as needed. It's also important to regularly inspect the ball joints and tie rods. These components can wear out, leading to loose steering and poor handling. If you notice any play in the steering or suspension, have them inspected and replaced if necessary.

Concerning the steering system, a common issue is related to the power steering. Some 2015 Polaris Sportsman 850 models are equipped with power steering, which makes it easier to steer the ATV, especially at low speeds. Power steering systems can sometimes fail, leading to stiff steering or a complete loss of power assistance. If you suspect a power steering issue, it's best to have it inspected by a qualified mechanic. They can diagnose the problem and determine if any repairs or replacements are needed.

Common Preventative Maintenance

Alright, let's look at what you can do to keep your 2015 Polaris Sportsman 850 running smoothly and prevent some of the issues we've discussed. Preventative maintenance is key to a long and trouble-free life for your ATV. Here's a quick rundown of some essential tasks.

Firstly, follow the maintenance schedule in your owner's manual. Polaris provides a detailed schedule of maintenance tasks that should be performed at specific intervals. This schedule covers everything from oil changes to valve adjustments, and following it will help prevent many potential problems.

Regular oil changes are crucial. Changing the oil and filter at the recommended intervals is essential for keeping the engine running smoothly. Use the correct type of oil and filter recommended by Polaris. Make sure to regularly check and clean or replace the air filter. A clean air filter is essential for protecting the engine from dirt and debris. Inspect the filter regularly and replace it as needed.

Also, check your fluids regularly. Check the levels of all fluids, including coolant, brake fluid, and transmission fluid. Top off any fluids that are low. Keep your ATV clean. After each ride, wash your ATV to remove dirt, mud, and debris. This will help prevent corrosion and keep your ATV looking its best. Properly store your ATV. If you're not going to be using your ATV for an extended period, store it properly to protect it from the elements. This includes covering it and storing it in a dry place.

Conclusion: Keeping Your Polaris Sportsman 850 Running Strong

So, there you have it, guys. We've covered some of the most common issues that you might encounter with your 2015 Polaris Sportsman 850. Remember, most of these problems are manageable with proper maintenance and a little bit of knowledge. By staying on top of regular maintenance, keeping an eye out for these common issues, and addressing them promptly, you can keep your ATV running strong for years to come. Now get out there and enjoy the ride! Stay safe and happy trails!