Choosing the Right Aftermarket Spark Plug for Your 1998-2009 Arctic Cat 500 4x4
A bad spark plug is a common reason for engine problems—here’s how to choose the right replacement for your ATV.
- The NGK CR6E is the most recommended aftermarket spark plug for the 1998-2009 Arctic Cat 500 4x4.
- Always verify the spark plug gap is set to 0.7mm before installation.
- A "no spark" issue on this ATV may be caused by a faulty flywheel, a known weak point, not just the spark plug.
- Replacement is a simple, 15-minute job requiring basic tools, making it an easy first step in troubleshooting engine issues.
Symptoms of a Failing Spark Plug
A worn-out or fouled spark plug can cause a range of noticeable problems on your Arctic Cat 500. Because it's an inexpensive and easy part to replace, it's often the first thing to check when you experience engine trouble. Common symptoms include:
- Hard Starting or No Start: A weak or nonexistent spark will make it difficult or impossible to start the engine.
- Rough Idle: If the plug isn't firing consistently, the engine may shake or run unevenly at idle. 🎬 Watch: Troubleshooting a rough idle on your Arctic Cat
- Engine Misfires or Backfiring: You might hear popping or sputtering sounds from the engine or exhaust, especially under acceleration.
- Poor Acceleration: A struggling spark plug can't burn fuel efficiently, leading to sluggish performance.
- Reduced Fuel Economy: When the engine isn't running efficiently due to poor ignition, it will use more fuel than normal.
A Note on "No Spark" Issues
While a bad spark plug is a possible cause for a no-spark condition, the 1998-2009 Arctic Cat 500 models are known for a common issue with the flywheel. The magnets on the original flywheel can come loose, causing an intermittent or total loss of spark. 🎬 Watch: How to diagnose flywheel and stator charging problems If a new, correctly gapped spark plug doesn't solve your no-spark problem, the flywheel, stator, or CDI unit are the next components to investigate.
🎬 See this walkthrough on common Arctic Cat no-spark issuesChoosing the Best Aftermarket Spark Plug
When it comes to spark plugs for the Arctic Cat 500, aftermarket options are not only affordable but often meet or exceed OEM quality. The engine used in many of these ATVs was made by Suzuki, and owners have found great success with Japanese aftermarket brands.
Brand Recommendations
Based on owner feedback and parts supplier data, NGK is the most highly recommended brand for this ATV.
- Top Tier (Recommended): NGK - The standard NGK plug, part number CR6E, is widely cited as the go-to replacement for all model years from 1998-2009. It offers excellent reliability and performance that is equivalent to the original factory plug. Iridium versions like the NGK Iridium IX are also available and offer a longer service life, though at a higher cost.
- Mid Tier: Denso & Champion - Denso and Champion are reputable brands that offer compatible spark plugs. While less commonly discussed by owners for this specific model, they are a viable alternative if an NGK plug is not available.
- Economy Tier: Autolite - Autolite provides a budget-friendly option that can get your machine running, though long-term durability may not match that of the top-tier brands.
Always Check the Gap
Even if a spark plug is advertised as "pre-gapped," you should always verify the gap with a feeler gauge or gap tool before installation. The correct gap for the standard NGK CR6E is 0.7 mm. An incorrect gap can lead to poor performance and starting issues.
Aftermarket Spark Plug Cost
| Plug Type | Typical Price Range (Single Plug) | Notes |
|---|---|---|
| Standard Copper/Nickel (e.g., NGK CR6E) | $10 - $18 | The most common and recommended type. Excellent performance for the price. |
| Iridium (e.g., NGK Iridium IX) | $15 - $25 | Longer lifespan and slightly more consistent spark. Good for riders who want extended service intervals. |
| Multi-Packs (4-Pack) | $40 - $60 | A cost-effective way to have spares on hand for regular maintenance. |
Frequently Asked Questions (FAQ)
How often should I replace the spark plug on my Arctic Cat 500?
For a standard copper/nickel plug, it's good practice to inspect it annually and replace it every 100 hours of use or every other year, whichever comes first. If you frequently ride in wet or muddy conditions, more frequent checks are recommended. An iridium plug can last longer, but regular inspection is still wise.
Where is the spark plug located?
On the Arctic Cat 500 4x4, the spark plug is located on the left side of the engine. You will likely need to remove the plastic side panel to gain access. You will see a thick black wire (the plug wire) attached to a boot that covers the top of the spark plug.
What tools do I need to change the spark plug?
You will need a ratchet, a spark plug socket (typically 16mm or 5/8"), a spark plug gap tool, and potentially a screwdriver or Allen key to remove the side panel. Applying a small amount of anti-seize compound to the new plug's threads is also recommended to make future removal easier.
Is an OEM spark plug better than aftermarket?
Not necessarily. For this vehicle, high-quality aftermarket brands like NGK are considered OEM-equivalent and are used widely by owners and mechanics with great results. You can confidently use a recommended aftermarket plug without sacrificing quality or performance.
Helpful Videos
Technical Specifications
OEM Part Numbers: 0217-708
Recommended Aftermarket Plug: NGK CR6E Thread Diameter: 10mm Thread Reach: 19mm Hex Size: 16mm (5/8") Gap: 0.7mm
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Arctic Cat 500 4x4: