Accel U-groove 99-17 twincam; 86-21 XL Sportster

U-Groove Spark plug Fits:> 99-17 Twincam; 86-21 XL Sportster

set

Accel spark plugs feature the U-Groove ground electrode allowing the spark to build a Ball-of-Fire flame, providing you with a smoother idle and more complete combustion. Other features are: Five-rib "alumina" powder insulator to prevent flash-over and misfire, copper glass inner seal and electric heat seal to prevent combustion leakage, fused copper/nickel center electrode providing super conductivity and a wide heat range.

part numbers

•  231717: 2418; HD6R12PP, replace 32329-97;  99-17 TCA/B; 86-21 XL (exclude. XR1200)