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HKS Rotary Applications M-Series Spark Plugs Heat Range 10.5 - Black Ops Auto Works
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HKS Rotary Applications M-Series Spark Plugs Heat Range 10.5

HKS
HKS50003-M525RE
4957266720349
Spark Plugs
Out of stock
$ 460.00
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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

Request For Information

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