Radical Spark Plug Various models

Radical spark plugs ensure reliable ignition and consistent engine performance in 2-stroke and 4-stroke engines. Depending on the model, they are ideal for stock engines or sport-tuned setups with high RPMs.

The iridium versions offer improved starting performance, more precise combustion, and a longer service life compared to classic standard spark plugs.

Technical Specifications

• Thread diameter: 14 mm
• Thread pitch: 1.25 mm
• Thread length: 19 mm
• Wrench size: 21 mm
• Seal type: Flat seal
• Noise suppression: 5 kOhm
• Electrode spacing: 0.8 mm
• Removable SAE connector

Variants

• R9-LOSD – comparable to NGK BR9ES – standard nickel spark plug, heat range 9
• R9-LORD – comparable to NGK BR9EIX – Iridium spark plug, heat range 9
• R8-LORD – comparable to NGK BR8EIX – iridium spark plug, heat range 8

Special Features

• 1859063 with nickel center electrode
• 1859085 and 1859086 with a fine 0.6 mm iridium center electrode
• Improved starting performance and clean combustion
• Reliable ignition even at high RPMs
• Long service life of the iridium versions

Package Contents

• 1x Radical spark plug, depending on selection