Choosing the Right Spark Plug for Your 1999-2009 Arctic Cat 250 2x4
Get your ATV running right by picking the perfect new aftermarket spark plug.
- The standard, reliable replacement spark plug is the NGK DPR7EA-9.
- Before installing, always verify the spark plug gap is set to 0.035 inches (0.9mm).
- For longer life and potentially smoother performance, consider the NGK DPR7EIX-9 iridium upgrade.
- If a new spark plug doesn't resolve a spark-related running issue, investigate the ignition coil, CDI, and stator next.
Signs of a Failing Spark Plug
A worn-out or fouled spark plug can cause noticeable problems with your ATV's performance. Because the spark plug is a routine maintenance item, it's often the first thing to check if you experience engine trouble. Look out for these common symptoms:
- Hard Starting: The engine turns over but takes a long time to start, or won't start at all. 🎬 Watch: Troubleshooting guide if your Arctic Cat won't start.
- Rough Idle: The engine sputters or runs unevenly when you're not giving it gas.
- Engine Misfires: You might feel a hesitation or stumble from the engine during acceleration.
- Poor Performance: A general loss of power and slower acceleration.
- Bad Fuel Economy: You'll find yourself filling up the gas tank more often.
Choosing the Right Aftermarket Spark Plug
For the 1999-2009 Arctic Cat 250 2x4, the original factory plug is an NGK, which is widely available in the aftermarket. This makes choosing a replacement straightforward. Aftermarket options provide the same quality as the original, often at a better price.
Brand Tiers
- OEM-Equivalent (Best Bet): NGK is the brand most commonly recommended and used for this ATV. The standard replacement plug is the NGK DPR7EA-9. It offers reliable performance and is a direct-fit replacement. For an upgrade, the NGK DPR7EIX-9 is an iridium version that provides a longer service life and improved spark performance.
- Reliable Alternatives: Brands like Champion and Denso also produce compatible spark plugs for this model. While less commonly discussed in owner forums for this specific ATV, they are reputable manufacturers that offer quality replacement options.
Check The Gap
Even if a spark plug is advertised as "pre-gapped," you should always verify the gap before installation. Use a gap tool to make sure the spacing is set to 0.035" (0.9mm). 🎬 See how to gap spark plugs for the best performance. An incorrect gap can cause running issues.
Key Specifications for Your Arctic Cat 250 2x4
| Specification | Value |
|---|---|
| Standard Part Number | NGK DPR7EA-9 |
| Iridium Upgrade | NGK DPR7EIX-9 |
| Spark Plug Gap | 0.035" (0.9mm) |
| Wrench / Socket Size | 18mm |
| Thread Diameter | 12mm |
Aftermarket Spark Plug Cost
The price for a new aftermarket spark plug depends on the type. Standard copper plugs are very affordable, while premium iridium plugs cost more but last longer.
| Plug Type | Estimated Price |
|---|---|
| New Aftermarket (Standard Copper) | $3.91 - $8.00 |
| New Aftermarket (Iridium) | $9.00 - $17.05 |
Don't Over-tighten!
When installing the new plug, thread it in by hand to prevent cross-threading. Then, use a wrench to tighten it, but do not use excessive force. Over-tightening can damage the threads in the engine's cylinder head, leading to a very expensive repair.
Frequently Asked Questions
Is an iridium spark plug worth the extra cost?
For many riders, yes. An iridium plug like the NGK DPR7EIX-9 costs more upfront but can last two to three times longer than a standard copper plug. It also provides a more consistent spark, which can improve starting and smooth out the idle.
How often should I change the spark plug on my Arctic Cat 250?
It's good practice to inspect your spark plug every season and replace it if it looks worn or fouled. A standard copper plug should be replaced every year or two, depending on how much you ride. An iridium plug can last much longer. Always refer to your owner's manual for specific service intervals.
What if a new spark plug doesn't fix my engine problem?
While the spark plug is a common culprit, a no-spark or erratic spark condition can also be caused by other parts of the ignition system. If a new, correctly gapped plug doesn't solve your issue, the problem may lie with the spark plug wire, ignition coil, CDI box, or stator.
🎬 Watch: How to diagnose electrical and ignition system issues.Are there any recalls for the spark plug on this ATV?
No. Searches for official recalls and Technical Service Bulletins (TSBs) found no issues related to the spark plug for the 1999-2009 Arctic Cat 250 2x4. Recalls for Arctic Cat ATVs from this era were related to other components like fuel fittings or gear casings.
Helpful Videos
Technical Specifications
OEM Part Numbers: DPR7EA-9
Standard Plug: NGK DPR7EA-9. Iridium Plug: NGK DPR7EIX-9. Gap: 0.035" (0.9mm). Wrench Size: 18mm. Thread Diameter: 12mm. Thread Reach: 19mm.
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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 250 2x4: