NGK 594606E8-C05191 Resistor Sparkplug LMAR6A-9

( Brand: Ngk ), ( Manufacturer Part Number: 594606E8-C05191 ), ( Part Type: Resistor ), ( Item Length: 1.000 )

Review NGK Resistor Sparkplug Yamaha fits GRIZZLY 700 4X4 2009–2013

The **NGK 594606E8-C05191 Resistor Spark Plug (LMA8A-9)** is a precision-engineered ignition component specifically designed for Yamaha s **Grizzly 700 4x4** models manufactured between **2009 and 2013**. This high-performance spark plug combines advanced materials and cutting-edge technology to deliver reliable, efficient, and long-lasting ignition performance, ensuring optimal engine power, smooth acceleration, and reduced emissions. Engineered with a **resistor tip**, this plug is tailored to work seamlessly with the Grizzly s electronic ignition system, minimizing radio interference while maintaining consistent spark generation under varying load conditions. The **LMA8A-9** designation indicates a **14mm thread size**, a **19mm shell diameter**, and a ** -inch reach**, perfectly matching the engine s spark plug hole dimensions for a secure, leak-free fit. Constructed from **high-quality nickel alloy**, the electrode resists corrosion and wear, providing extended service life even in demanding off-road and heavy-duty applications. The **heat range of 8** strikes a balance between thermal efficiency and cold-weather starting, preventing fouling in cooler climates while avoiding pre-ignition in high-performance scenarios. NGK s proprietary **resistor coating** further enhances durability, reducing the risk of electrical shorts and ensuring consistent performance over thousands of miles. Whether tackling rugged trails or daily commutes, this spark plug is a critical component for maintaining the Grizzly 700 s robust power delivery, fuel economy, and overall engine health. Ideal for both original equipment replacement and performance upgrades, the **NGK 594606E8-C05191** is a dependable choice for Yamaha enthusiasts seeking peak ignition reliability.

### **NGK 594606E8-C05191 Resistor Spark Plug (LMA6A-9) for Yamaha Grizzly 700 4x4 (2009 2013): Pros and Cons**

1. **OEM Equivalence** This is the exact replacement part recommended by Yamaha for the Grizzly 700 s engine (LH66 engine). Using an OEM or equivalent plug ensures proper fitment, gap, and performance alignment with the manufacturer s specifications.

2. **Proven Reliability** NGK is a well-established brand with decades of experience in spark plug manufacturing. Their resistor-type plugs (like the LMA6A-9) are designed to reduce radio interference, which is beneficial for vehicles with electronic systems.

3. **Durability** The LMA6A-9 is a long-life plug (typically 10,000 20,000 miles, depending on driving conditions). Its platinum-tipped electrode resists wear and fouling better than traditional iridium or copper plugs, reducing the need for frequent replacements.

4. **Consistent Performance** The resistor coating helps prevent misfires caused by electrical noise, which can be particularly useful in off-road or high-stress conditions where the engine operates under varied loads.

5. **Widely Available** NGK plugs are stocked by most auto parts retailers (AutoZone, O Reilly, local shops), making replacements convenient and reducing lead times.

6. **Cost-Effective for Long-Term Use** While the upfront cost is moderate, the longevity of the plug can offset the expense compared to cheaper, shorter-lived alternatives.

7. **Compatibility with Aftermarket Mods** If you ve installed performance parts (e.g., cold air intake, exhaust), the LMA6A-9 s reliable ignition can help maintain stable combustion, though upgrading to a higher-performance plug (e.g., iridium) may be warranted for significant mods.

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1. **Higher Initial Cost Than Basic Plugs** Compared to budget copper or iron plugs, NGK s resistor-type plugs are more expensive upfront. However, this is justified by their longevity and reliability.

2. **Slightly Less Performance Than Iridium** While the LMA6A-9 is a high-quality plug, it is not as advanced as iridium or platinum-iridium plugs (e.g., NGK s Iridium IX or Laser plugs). If you prioritize peak performance or high-RPM applications, these may offer better ignition consistency.

3. **Resistor Coating May Not Be Ideal for Heavy Mods** The resistor is designed to reduce interference, but in heavily modified engines (e.g., forced induction, aggressive tuning), a plug without a resistor (like NGK s FP or FR series) might be preferable to avoid any potential ignition delays.

4. **Gap Sensitivity** Like all spark plugs, the LMA6A-9 requires proper gap setting (typically 0.024 0.028 inches for this plug). Incorrect gaps can lead to misfires or poor fuel economy. However, NGK provides clear gap specifications, and most shops can set it correctly.

5. **Platinum Wear Over Time** While durable, the platinum tip can still wear out after extensive use (especially in high-mileage engines or harsh conditions). Replacement intervals may vary based on driving habits.

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### **Conclusion**

The **NGK 594606E8-C05191 (LMA6A-9) resistor spark plug** is an excellent choice for the Yamaha Grizzly 700 (2009 2013) due to its OEM compatibility, reliability, and long service life. It strikes a balance between performance, durability, and cost-effectiveness for stock or lightly modified engines. The resistor feature also helps mitigate electrical interference, which is beneficial for off-road use.

However, if your Grizzly is heavily modified (e.g., turbocharged, aggressive tuning, or high-performance exhaust), consider upgrading to a **higher-performance plug** (e.g., NGK s Iridium IX or Laser series) for improved ignition consistency. For stock or mildly modified engines, the LMA6A-9 is a safe, high-quality option.

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### **Recommendation**

- **For Stock or Lightly Modified Grizzly 700 (2009 2013):** **Use the NGK 594606E8-C05191 (LMA6A-9)**. It meets OEM specs, provides reliable ignition, and reduces radio interference. Replace every **10,000 15,000 miles** or as recommended by your maintenance schedule.

- **For Heavily Modified or High-Performance Engines:** Consider **NGK s Iridium IX (LFR6A-11) or Laser (LFR6A-11L)** for better heat resistance and ignition reliability under extreme conditions.

- **Maintenance Tip:** Always check the gap (0.024 0.028") and inspect for fouling or wear during replacements. If the engine runs poorly (e.g., rough idle, misfires), have a professional diagnose the issue before assuming the plugs are faulty.

This plug is a **solid, no-frills choice** for the average Grizzly owner, but upgrading may be worth it for performance enthusiasts.

Details:

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part #: 594606e8c05191 prices

• $20.11-$107.99

specifications cyclesparkplugs:

• for models: 700, 4x4, Grizzly
• for makes: Yamaha
• for years: 2009-2013
• brand: Ngk
• mpn: 594606e8-c05191
• part type: Resistor
• item length: 1.000

seller cyclesparkplugs:

• city: Salem, UT
• # reviews: 94751
• rating: 99.6%

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• Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Spark Plugs
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