SKU: 50003-M525RE | UPC: 4957266720349
HKS Rotary Applications M-Series Spark Plugs Heat Range 10.5 for Mazda RX-7 (1986-2002) RX-8 (2004-2011)
HKS M-Series spark plugs with heat range 10.5 fit Mazda rotary engines in RX-7 FC FD and RX-8 models. These plugs resist pre-ignition and fouling during sustained high RPM operation in performance rotary applications. Install them for consistent combustion in modified 13B and Renesis engines.
Key Features
- Iridium Center Electrode: 0.4mm fine tip concentrates spark energy for efficient burn and extended service life over 40,000 miles
- Platinum Ground Electrode: Tapered pad design resists wear and maintains spark focus under extreme heat
- Heat Range 10.5: Cold rating handles turbo boost and high compression in rotary engines without overheating
- M10 Thread 25mm Reach: Precise fit for leading and trailing positions in rotary housings
- Red Insulator: Visual identifier for 10.5 rating ensures correct heat range selection
Product Notes
- Sold individually requires 6 per 2-rotor engine
- Pre-gapped to 0.7-0.8mm verify before installation
- Handle carefully to avoid thread damage
Installation Notes
- Professional installation recommended.
- Torque to 18-21 Nm using anti-seize on threads
- Compatible with OEM coil packs and wiring harnesses
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1986-1991 | Mazda | RX-7 | FC Turbo NA |
| 1992-2002 | Mazda | RX-7 | FD Turbo Base |
| 2004-2011 | Mazda | RX-8 | All Renesis |
Why Choose HKS?
- Decades of rotary engine development experience
- Proven reliability in JDM racing applications
- Made in Japan with tight tolerances for rotary fitment
Frequently Asked Questions
- Q: Will these fit my RX-7 FD3S turbo engine?
A: Yes fits all 1992-2002 Mazda RX-7 FD models including REW twin turbo with 13B-RE engine use 3 per rotor housing - Q: What electrode materials are used?
A: 0.4mm iridium center electrode paired with platinum ground electrode for durability and spark efficiency - Q: Is a warranty included?
A: Covered under HKS limited warranty against manufacturing defects contact retailer for details
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: Special order ships in 3-5 business days
- Packaging: Individual protective box 1 x 1 x 5 inches
- Weight: 0.1 lbs
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