Champion RN12YC Spark Plugs for Harley-Davidson Shovelhead and EvolutionChampion RN12YC Spark Plugs for Harley Davidson Shovelhead and Big Twin Evolution Whether it's time for a tuneup or you're troubleshooting an acute ignition problem, these Champion spark plugs will restore lost ignition performance. Copper core Zinc plated shell for corrosion resistance Resistor for suppression of electromagnetic interference Sold as a pack of four

Torque cones can help restore lost performance when not at high-RPMs

try a modern paper filter and give your mill a little treat

installing one extra plate and steel is a longstanding mechanical upgrade

complete with multiple illustrations

Engineered for performance

and spacers

These high quality Made In USA chrome plated petcocks are designed for high flow and years of worry free use

The spacers are TIG welded to the mounting plates

then you need this capacitor

and ignition systems

this unit from Drag will do the job

the one piece design eliminates the possibility of a cracked seat pivot bracket caused by a failed weld