Harley-Davidson Screamin' Eagle ST Performance Spark Plugs

Screamin' Eagle ST Performance Spark Plugs feature a double platinum coating for exceptional erosion resistance and an extended service life. The V-trimmed ground electrode minimizes flame front shrouding to enhance flame propagation, while the fine wire center electrode provides improved start-ups and superior ignitability. Engineered with Ribbed Core Technology (RCT) to actively resist fouling, these standard-compression spark plugs also include Original Equipment-style noise suppression to eliminate electrical interference with radios and communication systems. Finished with the signature Screamin' Eagle logo, they deliver reliable performance for stock compression engines with high-flow air cleaners, performance exhausts, or racing air/fuel mixtures. Key Features Brand Screamin' Eagle Manufacturer Harley-Davidson Product Type Spark Plugs Part Number 31600106 Plating / Coating Double Platinum Electrode Type V-Trimmed Ground / Fine Wire Center Application Standard Compression Technology Ribbed Core Technology (RCT) Quantity Pair (Set of 2) Highlights For Standard Compression Applications Features Ribbed Core Technology (RCT) that provides resistance to fouling Designed with Original Equipment-style noise suppression to prevent electrical interference with radios and CB communication equipment Works great in racing applications where rich air/fuel conditions are required Designed for modified engines including performance carburetors, high-flow air cleaners, camshafts, exhaust systems, and ignition systems in conjunction with stock compression ratios Unique style with Screamin' Eagle logo Sold in pairs Fits 99-17 Twin Cam-equipped models and 86-22 Evolution Sportster 883, 1100, and 1200 models In the Box: 2 spark plugs Screamin' Eagle products are 50-State U.S. EPA compliant for sale and use on all applicable vehicles including those that are pollution controlled Compatibility Fits 1999–2017 Twin Cam-equipped models and 1986–2022 Evolution Sportster 883, 1100, and 1200 models. Frequently asked questions Which Harley-Davidson models are compatible with these spark plugs? These spark plugs fit 1999–2017 Twin Cam-equipped models and 1986–2022 Evolution Sportster 883, 1100, and 1200 models. How many spark plugs are included in the package? They are sold in pairs and include two spark plugs per package. What is the benefit of the Ribbed Core Technology (RCT)? Ribbed Core Technology (RCT) provides enhanced resistance against spark plug fouling. Will these spark plugs interfere with motorcycle audio or CB communications? No, they are designed with Original Equipment-style noise suppression to prevent electrical interference with radios and CB communication equipment.