Precision Spark Delivery for Classic and Heritage Vehicles

VXPRO Rotor Arms are engineered to OE standards to deliver precise, consistent spark distribution in traditional ignition systems. Built using durable, heat-resistant materials, they ensure long service life, reliable contact, and optimal engine performance in classic and heritage applications.

Backed by a 5-year warranty and supported by TechASSIST and StockASSIST, VXPRO Rotor Arms give workshops the confidence to keep vintage engines running smoothly for years to come.

Rotor Arm

StockASSIST: Keeping the Spark Alive

Classic ignition components still see strong demand from specialists and enthusiasts. StockASSIST pinpoints the most requested rotor arms so you can keep the right parts in stock.
Here are 10 of our popular VXPRO rotor arms:

Rotor Arms

ET1200

Rotor Arm

Rotor Arm

ET1201

Rotor Arm

Rotor Arm

ET1202

Rotor Arm

Rotor Arm

ET1203

Rotor Arm

Rotor Arm

ET1204

Rotor Arm

Rotor Arm

ET1205

Rotor Arm

Rotor Arm

ET1206

Rotor Arm

Rotor Arm

ET1208

Rotor Arm

Rotor Arm

ET1216

Rotor Arm

Rotor Arm

ET1228

Rotor Arm

TechASSIST: Product Support and Information

In a traditional distributor-based ignition system, the rotor arm: Rotates inside the distributor cap, transferring the high-voltage spark from the ignition coil to the correct cylinder terminal Ensures precise ignition timing for smooth running and performance Operates under extreme conditions of high voltage, heat, and vibration Works in unison with the cap and contact set to complete the ignition circuit A worn or faulty rotor arm can cause severe misfiring, poor starting, or total engine failure.

Why Do They Fail?

Rotor arms can fail due to:

  • Carbon tracking or burning from high voltage arcing

  • Excessive wear of the conductive tip

  • Cracking or distortion of the rotor body due to heat or vibration

  • Poor-quality materials that break down prematurely

  • Moisture ingress, leading to corrosion and weak spark delivery

Symptoms of a Faulty Rotor Arm

  • Misfires across one or more cylinders

  • Difficulty starting, especially in damp conditions

  • Loss of power or hesitation under load

  • Engine stalling at idle or while driving

  • Visible damage such as cracks, burning, or erosion on inspection

Fitting Tips

  1. Inspect the distributor shaft and cap before fitting — worn shafts can cause uneven rotor wear

  2. Ensure the rotor is the correct length and profile for the application

  3. Avoid touching the conductive tip with bare hands to prevent contamination

  4. Replace the rotor arm and cap together for best results

  5. Check ignition timing after installation if specified by the manufacturer