Hey guys, so you've got a Polaris Sportsman 850, huh? That's awesome! These ATVs are beasts, built for some serious off-road action. But, like any machine, they sometimes need a little TLC. Whether you're a seasoned mechanic or just starting out, this guide is packed with info to help you keep your Sportsman 850 running smooth. We'll cover common issues, repair tips, and even some preventative maintenance to keep you out on the trails longer. Let's dive in!

Common Issues and Symptoms

Alright, let's talk about what can go wrong with your Polaris Sportsman 850. Knowing the common problems is the first step in keeping your ATV in top shape. Here’s a breakdown of some frequent issues, along with the telltale signs:

• Engine Starting Problems: This is a classic! If your engine is slow to start, or won't start at all, it can be a real pain. The causes can range from a dead battery or loose connections, all the way to a faulty starter motor or a more complex fuel injection issue. Check for a clicking sound when you hit the start button; this often points to battery problems. Other indicators include the engine cranking but not firing up, which could mean the fuel pump isn't working or the spark plugs are fouled.
• Overheating: This is something you definitely want to catch early. Overheating can damage your engine pretty quickly. Keep an eye on your temperature gauge! If it starts creeping up, pull over immediately. Common culprits are a clogged radiator, a faulty water pump, or a low coolant level. Look for signs like steam coming from the engine or a sweet smell (coolant leaking). Make sure to let the engine cool down completely before checking the coolant level.
• Loss of Power: If your Sportsman 850 feels sluggish or can't climb hills like it used to, there could be a problem. This might be due to a dirty air filter, a clogged fuel injector, or even a problem with the CVT (Continuously Variable Transmission) belt. Other potential issues are a worn clutch, or problems with the throttle position sensor. Listen for any unusual noises coming from the engine or transmission. Consider getting the ATV tuned up and have the engine components and the CVT checked.
• Suspension and Steering Issues: The suspension on the Sportsman 850 is designed to take a beating, but it can still wear out over time. If you notice a rough ride, excessive bouncing, or clunking noises, it’s time to check things out. The problems might range from worn shocks or bushings to bent control arms. Also, if your steering feels loose or if the ATV is hard to control, look at things such as tie rods or ball joints.
• Electrical Problems: Electrical gremlins can be frustrating! These problems can manifest in several ways, from the headlights not working to the ATV randomly shutting down. Loose wires, corroded connectors, and faulty sensors are often the usual suspects. A good multimeter can be your best friend in this case. Check the fuses, and inspect the wiring harness for damage.
• CVT Belt Issues: The CVT belt is essential for transferring power to the wheels. If it breaks or wears out, your ATV won't move. Symptoms include a slipping sensation, a burning smell, or the ATV not moving at all. Regular inspection and replacement of the CVT belt are a must.
• Fuel System Issues: Fuel pumps and injectors can fail, leading to starting problems, loss of power, and poor fuel efficiency. Check fuel lines for leaks and listen for the fuel pump priming when you turn on the ignition. Ensure the fuel filter is not clogged. Use quality fuel and fuel stabilizers to help prevent issues.

Keep in mind these are just some of the common issues. Any time you notice something different with your Sportsman 850, it's best to investigate right away, so you can prevent more significant damage and get back on the trails!

Troubleshooting and Repair Tips

Okay, so you've identified a problem. Now, what do you do? Here are some troubleshooting and repair tips for some of the common issues, along with advice on how to fix things:

• Engine Won't Start:
  • Check the Battery: Start with the basics. Make sure your battery is charged and that the terminals are clean and tight. Try jumping the ATV to see if that gets it going. A weak battery is a frequent cause of starting problems.
  • Inspect the Fuel System: Make sure fuel is getting to the engine. Check the fuel filter for blockages, and make sure the fuel pump is running. You can test the fuel pump by listening for a whirring sound when you turn the key.
  • Check the Spark Plugs: Remove the spark plugs and inspect them. Look for any signs of fouling or damage. Replace the spark plugs if necessary. Make sure to gap them correctly according to your owner's manual.
  • Examine the Starter Motor: A faulty starter motor can also cause starting problems. Try tapping on the starter motor with a hammer while someone attempts to start the ATV. If it starts, you might need to replace the starter motor.
  • Run a Diagnostic: Modern ATVs have onboard computers. Use a diagnostic tool to check for error codes. This can help pinpoint the problem more accurately.
• Overheating:
  • Check the Coolant Level: Make sure your coolant level is up to the recommended level. Add coolant as needed. Be sure to use the correct type of coolant for your Polaris Sportsman 850.
  • Inspect the Radiator: Look for any clogs or debris in the radiator. Flush the radiator if necessary. Cleaning the radiator can often solve an overheating problem.
  • Check the Water Pump: A faulty water pump will not circulate coolant effectively. Check for leaks around the water pump. You may need to replace the water pump if it's not working properly.
  • Inspect the Fan: Ensure the cooling fan is working. Check the fan motor and the fan switch. Overheating can quickly cause serious engine damage, so don’t take this lightly.
• Loss of Power:
  • Check the Air Filter: A dirty air filter restricts airflow to the engine. Replace or clean the air filter regularly. A clean air filter is essential for the engine to run efficiently.
  • Inspect the Fuel Injectors: Clogged fuel injectors can cause a loss of power. Clean or replace the fuel injectors as needed. Use a fuel injector cleaner for this task.
  • Check the CVT Belt: A worn or damaged CVT belt can cause the ATV to feel sluggish. Inspect and replace the belt as needed. The CVT belt needs regular inspection as part of your maintenance schedule.
  • Examine the Exhaust System: Make sure the exhaust is not blocked. A blocked exhaust can restrict engine performance.
• Suspension and Steering Issues:
  • Inspect Shocks and Bushings: Worn shocks and bushings can cause a rough ride. Inspect and replace them as needed. Keep in mind that off-road riding takes its toll on these components.
  • Check the Tie Rods and Ball Joints: Loose or worn tie rods and ball joints can cause steering issues. Inspect and replace them as needed.
  • Check for Bent Components: Look for any bent control arms or other suspension components. Replace any bent parts.
• Electrical Problems:
  • Check Fuses: Blown fuses are a common cause of electrical problems. Replace any blown fuses.
  • Inspect Wiring: Look for any loose wires or corroded connectors. Repair or replace any damaged wiring.
  • Use a Multimeter: A multimeter can help you diagnose electrical problems. Use it to check for voltage and continuity. This is a crucial tool for electrical troubleshooting.
  • Inspect Sensors: Check the various sensors on the ATV. These can fail and cause electrical problems.

Always consult your owner's manual for specific instructions and torque specifications. Safety first, guys!

Preventative Maintenance: Keeping Your Sportsman 850 in Top Shape

Preventative maintenance is key to a long life and many happy rides with your Polaris Sportsman 850. Regular maintenance not only prevents breakdowns but also helps your ATV perform at its best. Here's a quick rundown of some essential tasks:

• Regular Oil Changes: This is arguably the most important thing you can do. Change the oil and filter regularly, following the manufacturer's recommendations. Use the correct type of oil for your ATV, and don't skimp on quality.
• Air Filter Maintenance: Clean or replace the air filter regularly. A clean air filter ensures that the engine gets clean air, which is essential for performance and longevity. Check the filter frequently, especially if you ride in dusty conditions.
• Coolant Flush: Flush and replace the coolant at the intervals specified in your owner's manual. This will help prevent overheating and protect the engine. Overheating can seriously damage the engine, so this is a crucial step.
• Grease Zerk Fittings: Most ATVs have grease fittings on the suspension components. Grease these fittings regularly to keep the suspension moving smoothly and prevent wear. Refer to your manual to locate all the fittings and use the correct type of grease.
• Check the CVT Belt: Inspect the CVT belt regularly for wear and tear. Replace it as needed. The CVT belt needs regular inspection, particularly if you are an aggressive rider.
• Inspect the Tires: Check your tire pressure before each ride. Inspect the tires for damage and wear. Make sure your tires are suitable for the terrain you're riding on.
• Battery Maintenance: Keep your battery charged and the terminals clean. If you don't use your ATV for extended periods, consider using a battery tender to keep the battery in good condition.
• Lubricate Moving Parts: Lubricate cables and other moving parts to keep everything working smoothly. This helps prevent corrosion and reduces friction.
• Check Brakes: Inspect your brake pads and rotors regularly. Replace them as needed. Brakes are a vital safety component, so keep them in good condition.
• Wash and Inspect Regularly: After each ride, wash your ATV and inspect it for any potential problems. This gives you a chance to spot issues early before they become bigger problems. Keeping your ATV clean also helps prevent corrosion.

By following this preventative maintenance schedule, you can minimize the risk of breakdowns and keep your Polaris Sportsman 850 performing at its best for years to come. Remember, a little maintenance goes a long way!

Where to Find Parts and Support

When it comes time to find parts or get repair support for your Polaris Sportsman 850, you've got several options. Knowing where to look can save you time and money. Here are some of the most common resources:

• Local Dealerships: Your local Polaris dealership is always a good starting point. They can provide genuine Polaris parts, perform repairs, and offer expert advice. They often have experienced technicians who know these ATVs inside and out.
• Online Retailers: There are many online retailers that specialize in ATV parts and accessories. These can be a great source for aftermarket parts, as well as OEM parts. Websites like Amazon, eBay, and dedicated ATV part stores offer a vast selection.
• Local Mechanics: If you don't want to do the repairs yourself, a local mechanic can be a good option. Make sure to find a mechanic who is experienced with ATVs, and preferably with Polaris ATVs specifically.
• Specialty Forums and Online Communities: There are tons of online forums and communities dedicated to ATVs, including the Polaris Sportsman 850. These forums can be a valuable resource for troubleshooting tips, repair advice, and recommendations for parts and service providers. You can often find answers to your questions and learn from other owners' experiences.
• Service Manuals: A service manual is an essential tool for any ATV owner. It provides detailed instructions, diagrams, and specifications for your ATV. You can usually find a service manual online or at your local dealership.

Don't hesitate to reach out to different resources to find the best parts, prices, and support for your specific needs. Research and compare prices from different vendors to make sure you're getting a good deal. With the right parts and support, you can keep your Polaris Sportsman 850 running great for years to come!

Final Thoughts: Keeping Your ATV Running Smoothly

There you have it, guys! This guide should give you a solid foundation for maintaining and repairing your Polaris Sportsman 850. Remember, the key to a long and happy life with your ATV is regular maintenance and addressing issues as they arise. Don't be afraid to get your hands dirty, and don't hesitate to seek help when you need it.

By taking care of your ATV, you'll be rewarded with countless hours of fun and adventure on the trails. Keep riding, keep exploring, and enjoy the power and performance of your Polaris Sportsman 850! Ride safe, and have a blast out there! Hopefully, this guide helped you out. Good luck with all your repair needs! And remember, happy trails!"