HKS Super Fire Racing M-Series Spark Plug M40i Qty 1 Plug | 50003-M40I
HKS Super Fire Racing M-Series Spark Plug M40i Qty 1 Plug | 50003-M40I is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Sign up to be the first to know when it's here
Have a Question?
Customer also asked
Product Features
0.6mm Iridium
Alloy Center ElectrodeIridium alloy center electrode reduces voltage requirement and improves ignition performance and durability.
Outer Electrode with Platinum ChipThe outer electrode incorporates a square platinum chip which improves durability, and combining with the iridium center electrode boosts ignition performance. The outer electrode features a shortened tip design and tapered shape while maintaining the necessary space for proper ignition.
Short Type Outer Electrode (Anti-Vibration)The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves longevity of the outer electrode.
Thermal EdgeAfter long idling or under various combustion conditions, carbon buildup can occur causing misfires. The thermal edge of the ceramic insulator discharges to help decrease carbon deposits.
Spark Support GapDischarge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup.
Performance and Efficiency
Increased Ignition Performance Decreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure. Improved Durability New material and design improve durability which allows for use under hard combustion conditions like continuous high load during circuit driving or aggressive tuning.
- Improper combustion condition and wrong heat range selection may cause damage to the spark plug. Decreased Carbon Deposits Thermal edge and spark support gap help prevent carbon buildup for better ignition under various combustion conditions.
Heat Range Conversion Chart
HKS Spark Plugs Specifications
Proposition 65 Warnings.
Cancer and Reproductive Harm. See details below.
Items that are not CARB Legal will not be sold and ship to California or CARB states.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
