NGK Spark Plug Kit

The FD3S runs surface gap plugs — a rotary-specific design that most general ignition knowledge doesn't apply to. Using the wrong plug affects combustion efficiency, apex seal life, and overall reliability. Getting this right matters.

We stock the correct NGK surface gap plugs in two configurations, with guidance on which to run for your setup.

Kit Options

• OEM Spec — 2x BUR7EQP + 2x BUR9EQP. Standard configuration for stock and mildly modified engines.
• All 9s — 4x BUR9EQP. Common choice for higher compression and forced induction applications.

Installation

Surface gap plugs do not require gap adjustment — the gap is fixed by design. Torque to 18–22 ft-lb (25–30 Nm). Leading plugs are the lower pair in each rotor housing; trailing plugs are the upper pair. Replace all four at the same time.

Fitment

Fits all FD3S RX-7 production years with a stock or mildly modified ignition system. Surface gap plugs require a high energy ignition system — they can be susceptible to fouling in cold or low-load applications but are largely immune to pre-ignition.

Plug Specifications

• Trivalent metal plating — anti-corrosion and anti-seizing
• Pure alumina silicate ceramic insulator — superior strength and heat transfer
• Corrugated ribs to prevent flashover
• Triple seals to prevent leakage
• Copper core for heat removal