Original Harley-Davidson Screamin Eagle spark plugs 31600106 / 2-pack / TwinCam from '99 and Evo Sportster from '86

Original Harley-Davidson Screamin Eagle spark plugs 31600106 / 2-pack / TwinCam from '99 and Evo Sportster from '86

• Screamin' Eagle spark plugs feature a double platinum coating for excellent wear resistance and long life
• The V-shaped ground electrode provides a focused flame front to aid flame spread
• The center thin wire electrode improves starting and ignition performance
• Screamin' Eagle spark plugs are based on Ribbed Core Technology (RCT), which makes them resistant to deposits
• In addition, just like the original plugs, they are equipped with a suppression resistor to avoid electrical interference with radios and CB radios
• Especially suitable for racing machines that require a rich air/fuel mixture. Unique styling with Screamin' Eagle logo
• Applications with stock compression pressure 
• For modified engines including performance carburetors, high flow air filters, camshafts, exhaust system and ignition system in conjunction with stock compression ratios
• Fits '99 and later Harley-Davidson Twin Cam models and '86 and later Evolution Sportster 883, 1100 and 1200 models