Powersport manufacturers are required to meet noise suppression standards throughout the world.  Spark plugs alone do not provide enough noise suppression therefore resistor covers were introduced. These resistor covers are designed to reduce “electromagnetic interference” and “radio frequency interference” which can interfere with electronic ignition components causing misfires and poor engine performance.

These resistor covers are manufactured using extremely durable phenolic resin and EPDM rubber. Ceramic resistors are used to ensure optimum performance and reliability. Resistor covers must withstand extreme heat, vibration, prevent flash over and must be waterproof.  These resistor covers are for motorcycle, marine, snowmobile and small engine applications only.

• Original Equipment fit, form, and function
• Available in various shapes and sizes
• Designed to fit removable terminal nut and solid terminal nut spark plugs
• Designed for 10 mm,12 mm and 14 mm diameter spark plugs

Spark plug cap types are listed below in the chart, select your cap type above.  Don't forget to purchase plug wires as well.