NGK Iridium IX Spark Plug LTR6IX-11 #6509 Box of 4 - 2022-2024 Ford maverick 2.0L
SKU: ngk6509
Overview
The NGK Iridium IX Spark Plug (LTR6IX-11 / #6509) is the go-to iridium upgrade for performance enthusiasts and daily drivers alike, delivering extreme ignitability, outstanding acceleration, and superior fuel efficiency over standard nickel alloy plugs. Engineered with a 0.6mm fine-wire iridium center electrode and tapered cut ground electrode, this plug is purpose-built for modern high-compression engines found in the 2022-2024 Ford Maverick. Whether you're replacing worn OEM plugs or upgrading from copper or platinum, the NGK Iridium IX LTR6IX-11 is a proven, CARB-compliant bolt-in solution sold here in a convenient BOX OF 4.
Key Features & Benefits
- 0.6mm Iridium Fine-Wire Center Electrode — Ultra-small tip reduces required firing voltage, producing a stronger, more consistent spark from your existing ignition system for improved combustion efficiency.
- Iridium Alloy Construction — 6× Harder Than Platinum — Iridium's exceptional density and extremely high melting point make it ideal for today's high-tech, high-performance engines, delivering long-lasting durability without electrode wear.
- Tapered Cut Ground Electrode — Reduces quenching around the flame kernel for superior ignitability, improved throttle response, better idle quality, and easier cold starts.
- 98% Pure Copper Core — Provides exceptional heat dissipation and conductivity across an ultra-wide heat range, keeping operating temperatures stable under varying loads.
- Trivalent Metal Plating — Delivers superior anti-corrosion and anti-seizing protection, ensuring smooth installation and hassle-free future removal — even after extended service intervals.
- Pure Alumina Silicate Ceramic Insulator — Provides superior structural strength and enhanced heat transfer, preventing pre-ignition and insulator cracking under high cylinder pressures.
- Corrugated Ribs & Triple Seals — Corrugated ribs prevent flashover along the insulator; triple seals prevent combustion gas leakage for reliable, consistent performance.
- Built-In Resistor (5K Ohm) — Suppresses electromagnetic interference (EMI) to protect modern vehicle electronics, sensors, and infotainment systems.
- CARB Compliant — Legal for sale and use in all 50 U.S. states, including California.
What's Included
- 4× NGK Iridium IX Spark Plugs — Part # LTR6IX-11 / 6509
Specifications
| Manufacturer Part # | LTR6IX-11 |
|---|---|
| NGK Stock # | 6509 |
| UPC | 087295165096 |
| Electrode Tip Material | Iridium |
| Center Electrode Diameter | 0.6mm |
| Electrode Core Material | Copper (98% Pure) |
| Center Electrode Type | Projected |
| Thread Diameter | 14mm |
| Thread Pitch | 1.25mm |
| Reach | 25mm (1.0 in.) |
| Seat Type | Tapered (No Gasket) |
| Hex / Wrench Size | 5/8 in. (16mm) |
| Terminal Type | Solid |
| Resistor | Yes — 5K Ohm |
| Manufacturer Heat Range | 6 |
| Pre-Set Gap | 0.043 in. (1.1mm) |
| Overall Height | ISO Standard |
| Ground Straps | 1 |
| CARB Compliant | Yes — 50-State Legal |
| Quantity | Box of 4 |
Torque Specifications
| Cast Iron Head | 10.8 – 18 lb-ft |
|---|---|
| Aluminum Head | 7.2 – 14.5 lb-ft |
Cross-Reference / OEM Equivalents
The NGK LTR6IX-11 (6509) cross-references to and replaces the following part numbers: CYFS12YP (Motorcraft), SP526 (Motorcraft), HR7MPP30X, IT20TT, IVT20TT, ITV20TT, ITV20, XP5863, XP5363, QSP5, 4719, 4714, 5339, 3017, 6728, and 9617.
Note: This is the stock heat range plug for the 2022-2024 Ford Maverick. Always confirm heat range suitability for modified applications. (If you are tuned you may need a colder plug, consult wirh your tuner)
Installation
The NGK LTR6IX-11 is a direct bolt-on replacement requiring no gap adjustment out of the box — the plug arrives pre-gapped at 0.043 in. (1.1mm). Use a 5/8 in. (16mm) spark plug socket and torque to spec based on your cylinder head material: 10.8–18 lb-ft for cast iron heads and 7.2–14.5 lb-ft for aluminum heads. Do not over-torque — the tapered seat design seals without a crush washer. Installation is suitable for experienced DIYers; no specialty tools beyond a standard spark plug socket and torque wrench are required. For modified, turbocharged, or supercharged applications, consult a tuner to confirm the correct heat range.
Frequently Asked Questions
Is the NGK LTR6IX-11 pre-gapped? Yes. These plugs come factory pre-gapped at 0.043 in. (1.1mm) and are ready to install.
Is this plug CARB compliant? Yes. The NGK Iridium IX LTR6IX-11 is CARB compliant and legal for use in all 50 U.S. states, including California.
How does iridium compare to platinum? Iridium is six times harder than platinum and has a significantly higher melting point, allowing for a finer 0.6mm electrode tip that lowers firing voltage and produces a stronger, more consistent spark over a longer service life.
What is the service interval? NGK Iridium IX plugs are designed for extended service intervals versus standard copper or nickel plugs. Refer to your vehicle's owner's manual for OEM-recommended replacement intervals, typically 60,000–100,000 miles for iridium-tipped plugs.
Overview
The NGK Iridium IX Spark Plug (LTR6IX-11 / #6509) is the go-to iridium upgrade for performance enthusiasts and daily drivers alike, delivering extreme ignitability, outstanding acceleration, and superior fuel efficiency over standard nickel alloy plugs. Engineered with a 0.6mm fine-wire iridium center electrode and tapered cut ground electrode, this plug is purpose-built for modern high-compression engines found in the 2022-2024 Ford Maverick. Whether you're replacing worn OEM plugs or upgrading from copper or platinum, the NGK Iridium IX LTR6IX-11 is a proven, CARB-compliant bolt-in solution sold here in a convenient BOX OF 4.
Key Features & Benefits
- 0.6mm Iridium Fine-Wire Center Electrode — Ultra-small tip reduces required firing voltage, producing a stronger, more consistent spark from your existing ignition system for improved combustion efficiency.
- Iridium Alloy Construction — 6× Harder Than Platinum — Iridium's exceptional density and extremely high melting point make it ideal for today's high-tech, high-performance engines, delivering long-lasting durability without electrode wear.
- Tapered Cut Ground Electrode — Reduces quenching around the flame kernel for superior ignitability, improved throttle response, better idle quality, and easier cold starts.
- 98% Pure Copper Core — Provides exceptional heat dissipation and conductivity across an ultra-wide heat range, keeping operating temperatures stable under varying loads.
- Trivalent Metal Plating — Delivers superior anti-corrosion and anti-seizing protection, ensuring smooth installation and hassle-free future removal — even after extended service intervals.
- Pure Alumina Silicate Ceramic Insulator — Provides superior structural strength and enhanced heat transfer, preventing pre-ignition and insulator cracking under high cylinder pressures.
- Corrugated Ribs & Triple Seals — Corrugated ribs prevent flashover along the insulator; triple seals prevent combustion gas leakage for reliable, consistent performance.
- Built-In Resistor (5K Ohm) — Suppresses electromagnetic interference (EMI) to protect modern vehicle electronics, sensors, and infotainment systems.
- CARB Compliant — Legal for sale and use in all 50 U.S. states, including California.
What's Included
- 4× NGK Iridium IX Spark Plugs — Part # LTR6IX-11 / 6509
Specifications
| Manufacturer Part # | LTR6IX-11 |
|---|---|
| NGK Stock # | 6509 |
| UPC | 087295165096 |
| Electrode Tip Material | Iridium |
| Center Electrode Diameter | 0.6mm |
| Electrode Core Material | Copper (98% Pure) |
| Center Electrode Type | Projected |
| Thread Diameter | 14mm |
| Thread Pitch | 1.25mm |
| Reach | 25mm (1.0 in.) |
| Seat Type | Tapered (No Gasket) |
| Hex / Wrench Size | 5/8 in. (16mm) |
| Terminal Type | Solid |
| Resistor | Yes — 5K Ohm |
| Manufacturer Heat Range | 6 |
| Pre-Set Gap | 0.043 in. (1.1mm) |
| Overall Height | ISO Standard |
| Ground Straps | 1 |
| CARB Compliant | Yes — 50-State Legal |
| Quantity | Box of 4 |
Torque Specifications
| Cast Iron Head | 10.8 – 18 lb-ft |
|---|---|
| Aluminum Head | 7.2 – 14.5 lb-ft |
Cross-Reference / OEM Equivalents
The NGK LTR6IX-11 (6509) cross-references to and replaces the following part numbers: CYFS12YP (Motorcraft), SP526 (Motorcraft), HR7MPP30X, IT20TT, IVT20TT, ITV20TT, ITV20, XP5863, XP5363, QSP5, 4719, 4714, 5339, 3017, 6728, and 9617.
Note: This is the stock heat range plug for the 2022-2024 Ford Maverick. Always confirm heat range suitability for modified applications. (If you are tuned you may need a colder plug, consult wirh your tuner)
Installation
The NGK LTR6IX-11 is a direct bolt-on replacement requiring no gap adjustment out of the box — the plug arrives pre-gapped at 0.043 in. (1.1mm). Use a 5/8 in. (16mm) spark plug socket and torque to spec based on your cylinder head material: 10.8–18 lb-ft for cast iron heads and 7.2–14.5 lb-ft for aluminum heads. Do not over-torque — the tapered seat design seals without a crush washer. Installation is suitable for experienced DIYers; no specialty tools beyond a standard spark plug socket and torque wrench are required. For modified, turbocharged, or supercharged applications, consult a tuner to confirm the correct heat range.
Frequently Asked Questions
Is the NGK LTR6IX-11 pre-gapped? Yes. These plugs come factory pre-gapped at 0.043 in. (1.1mm) and are ready to install.
Is this plug CARB compliant? Yes. The NGK Iridium IX LTR6IX-11 is CARB compliant and legal for use in all 50 U.S. states, including California.
How does iridium compare to platinum? Iridium is six times harder than platinum and has a significantly higher melting point, allowing for a finer 0.6mm electrode tip that lowers firing voltage and produces a stronger, more consistent spark over a longer service life.
What is the service interval? NGK Iridium IX plugs are designed for extended service intervals versus standard copper or nickel plugs. Refer to your vehicle's owner's manual for OEM-recommended replacement intervals, typically 60,000–100,000 miles for iridium-tipped plugs.
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