Ngk 4091 Racing Series Spark Plug - R5671A-7 engine-radiators-components-cooling-fans 1987-1999 Harley Davidson FXSTC Softail

1987-1999 Harley Davidson FXSTC Softail Custom

Constructed from alloy steel to prevent rusting

2020-2024 KTM 85 SX (17/14)

and nipples

2021-2022 Honda SXS10S2XD Talon 1000X FOX Live Valve

Ngk 4091 Racing Series Spark Plug - R5671A-7 engine-radiators-components-cooling-fans 1987-1999 Harley Davidson FXSTC SoftailSpark Plug Code: R5671A 7 Ngk Racing series plugs are engineered to withstand the harshest engine conditions. Special insulator nose configurations improve throttle responce. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage.