HKS 50003-M40i Iridium Spark Plug M-Series Super Fire Racing

The HKS 50003-M40i is a high-performance M-Series Super Fire Racing spark plug featuring advanced iridium alloy construction designed for modified and high-output engines. This individual spark plug delivers improved ignition performance, enhanced durability, and superior resistance to carbon buildup under demanding conditions.

Key Features:

• 0.6mm iridium alloy center electrode for concentrated spark energy
• Outer electrode with platinum chip for extended service life
• Short-type outer electrode design minimizes vibration damage
• Thermal edge technology for optimal heat dissipation
• Spark support gap enhances ignition stability
• Nickel-plated housing prevents premature deterioration

The M-Series utilizes iridium alloy for its exceptional durability and extreme heat resistance, with a melting point of 2454°C compared to 1769°C for conventional materials. This allows the electrode to withstand high compression ratios and minor detonation without deterioration. The 0.6mm center electrode diameter provides a more focused spark while maintaining longevity that would typically be compromised with narrower electrode designs. Recommended for reliable ignition performance, superior durability, and anti-carbon buildup characteristics under high-load conditions.

Note: Spark plugs are sold individually. Verify heat range and application compatibility before installation.