M-Series Super Fire Spark Plugs
HKS M-Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti-carbon build-up.
M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load.
The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity. With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration. The Iridium plugs are available for multiple applications and offered in "colder" heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered.
Heat Range: NGK # 10.5
Thread Size: 14mm × 12.7mm
Wrench Size: 20.8mm
Fits:
| 1983 - 1985 | MAZDA | RX-7 | ALL | ALL | From 10/1983 Thru 9/1985 Production Date | SA22C Chassis | Stock Plug/Heat Range: ROTARY:9 |
| 1985 - 1988 | MAZDA | RX-7 | R2 | 1.3 | From 10/1985 Thru 8/1988 Production Date | FC3S/FC3C Chassis | Stock Plug/Heat Range: ROTARY:10,11 |
| 1988 - 1991 | MAZDA | RX-7 | R2 | 1.3 | From 9/1988 Thru 12/1991 Production Date | FC3S/FC3C Chassis | Stock Plug/Heat Range: ROTARY:7,9 |
| 1993 - 1995 | MAZDA | RX-7 | R2 | 1.3 | From 12/1991 Thru 8/2002 Production Date | FD3S Chassis | Stock Plug/Heat Range: ROTARY:7,9 |
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