The 5-Minute Guide to Changing Spark Plugs Ski Doo 850

If you’re a proud owner of a Ski-Doo 850, you know that maintaining your engine is crucial for optimal performance and longevity. One of the essential maintenance tasks is changing the spark plugs. While it might seem daunting at first, changing spark plugs on your Ski-Doo 850 is a relatively simple process that can be done by anyone with basic mechanical skills.

This comprehensive guide will walk you through the steps involved in changing spark plugs on your Ski-Doo 850, ensuring a smooth and successful experience. We’ll cover everything from the tools you’ll need to the proper procedure for replacing the plugs. By following these instructions, you’ll be able to confidently maintain your snowmobile and enjoy many more thrilling rides.

Essential Tools for the Job

Before you begin, it’s important to gather the necessary tools. Here’s a list of what you’ll need:

• Spark plug socket: This specialized socket is designed to fit the spark plug threads and provides a secure grip for removal and installation.
• Torque wrench: A torque wrench is essential for tightening the spark plugs to the correct specifications.
• Ratchet: A ratchet will be needed to turn the spark plug socket.
• Extension: An extension might be required to reach the spark plugs in some models.
• New spark plugs: Ensure you purchase the correct spark plugs for your Ski-Doo 850 model. Refer to your owner’s manual or consult a local dealer for the recommended spark plug type.
• Gloves: It’s always a good idea to wear gloves to protect your hands from dirt and grease.
• Shop towels: These will be helpful for wiping away any spills or excess oil.

Preparing for the Spark Plug Change

Once you have gathered all the necessary tools, it’s time to prepare your Ski-Doo 850 for the spark plug change. Here’s what you need to do:

• Park your snowmobile on a level surface: This will ensure stability and prevent any accidental movement during the process.
• Disconnect the battery: This is a crucial safety precaution to prevent any electrical hazards. Locate the battery terminals and disconnect the negative terminal first, followed by the positive terminal.
• Remove the airbox: The airbox needs to be removed to access the spark plugs. Consult your owner’s manual for specific instructions on removing the airbox for your model.
• Locate the spark plugs: The spark plugs are typically located on the top of the engine, near the cylinder heads.

Replacing the Spark Plugs: A Step-by-Step Guide

Now that you’ve prepared your snowmobile and gathered your tools, you can proceed with replacing the spark plugs:

1. Remove the old spark plugs: Using the spark plug socket, carefully remove the old spark plugs from the cylinder heads. Be sure to hold the socket firmly to prevent the spark plug from falling into the cylinder.
2. Inspect the old spark plugs: Before installing the new spark plugs, take a moment to inspect the old ones. Look for signs of wear, such as excessive gap, electrode erosion, or deposits on the insulator. This information can help you diagnose any potential engine issues.
3. Install the new spark plugs: Carefully thread the new spark plugs into the cylinder heads. Be sure to hand-tighten them first to ensure they are properly seated.
4. Tighten the spark plugs with a torque wrench: Once the spark plugs are hand-tightened, use the torque wrench to tighten them to the manufacturer’s specifications. Refer to your owner’s manual for the correct torque settings. Over-tightening can damage the spark plug threads, while under-tightening can lead to leaks and misfires.
5. Reconnect the battery: After installing the new spark plugs, reconnect the battery terminals in reverse order, starting with the positive terminal and then the negative terminal.
6. Reinstall the airbox: Carefully reinstall the airbox, ensuring all the connections are secure.
7. Start the engine: Once you’ve completed all the steps, start the engine and allow it to run for a few minutes to ensure everything is functioning properly.

Tips for Success

• Use the correct spark plugs: Make sure you use the right spark plugs for your Ski-Doo 850 model. Consult your owner’s manual or a local dealer for the correct specifications.
• Tighten the spark plugs to the correct torque: Over-tightening can damage the spark plug threads, while under-tightening can lead to leaks and misfires.
• Inspect the spark plugs regularly: It’s a good idea to inspect the spark plugs every 500-1000 miles or as recommended by your owner’s manual.

Beyond the Basics: Maintaining Your Ski-Doo 850 for Optimal Performance

Changing spark plugs is just one aspect of maintaining your Ski-Doo 850. To ensure optimal performance and longevity, consider these additional maintenance tips:

• Regular oil changes: Changing the oil regularly is crucial for keeping your engine lubricated and running smoothly. Refer to your owner’s manual for the recommended oil change intervals.
• Air filter maintenance: A clean air filter allows your engine to breathe properly and improves fuel efficiency. Clean or replace the air filter regularly, as recommended by your owner’s manual.
• Coolant checks: Ensure the coolant level is adequate and that there are no leaks. Coolant helps regulate engine temperature and prevents overheating.
• Drive belt inspection: Regularly inspect the drive belt for wear and tear. A worn-out drive belt can cause slippage and reduce performance.
• Regular cleaning: Keeping your Ski-Doo 850 clean and free of dirt and debris helps prevent corrosion and extends its lifespan.

Wrapping Up: Your Ski-Doo 850 is Ready for the Trails

By following these steps and incorporating regular maintenance practices, you can confidently keep your Ski-Doo 850 in top condition. With a little care and attention, you’ll be able to enjoy many more thrilling rides on the snow.

Information You Need to Know

Q: How often should I change spark plugs on my Ski-Doo 850?
A: The recommended spark plug replacement interval for a Ski-Doo 850 is typically every 500-1000 miles or as recommended by your owner’s manual. However, it’s a good idea to inspect the spark plugs more frequently for signs of wear or damage.

Q: What happens if I don’t change my spark plugs?
A: If you don’t change your spark plugs, they can become worn out and cause a variety of problems, including:

• Reduced engine performance: Worn-out spark plugs can cause misfires, leading to a loss of power and acceleration.
• Increased fuel consumption: Misfires can result in inefficient combustion, leading to higher fuel consumption.
• Engine damage: In extreme cases, worn-out spark plugs can cause serious engine damage, such as pre-ignition or detonation.

Q: Can I change the spark plugs myself?
A: Yes, changing spark plugs on a Ski-Doo 850 is a relatively simple process that can be done by anyone with basic mechanical skills. However, if you are not comfortable working on your snowmobile, it’s always best to consult a qualified mechanic.

Q: What type of spark plugs should I use?
A: The type of spark plugs you need will depend on your specific Ski-Doo 850 model. Consult your owner’s manual or a local dealer for the correct spark plug specifications.

Q: How do I know if my spark plugs are worn out?
A: Signs of worn-out spark plugs include:

• Excessive gap: The gap between the electrodes should be within the manufacturer’s specifications. If the gap is too wide, it can cause misfires.
• Electrode erosion: The electrodes can wear down over time, reducing their ability to spark.
• Deposits on the insulator: Deposits on the insulator can hinder the spark plug’s performance.