Norton Commando 850 MK3 Balance Pipe Collet Lock Ring (065260)

Norton Commando 850 MK3 balance pipe collet lock ring (part number 065260) is the correct retaining collet and lock ring assembly used to secure the balance pipe crossover tube on the Norton Commando 850 MK3 exhaust system. Sold per side, this is a precision-fit component that keeps the balance tube firmly located between the two exhaust headers — maintaining the exhaust scavenging effect that defines the MK3’s mid-range power character.

The balanced pipe system on the 850 MK3 was a significant engineering development for the Commando. The crossover balance tube equalizes exhaust pressure pulses between the two cylinders, reducing back-pressure and improving torque delivery in the mid-range. When the collet lock rings wear, corrode, or go missing, the balance tube can work loose — causing exhaust leaks, rattles, and a loss of the scavenging benefit. Fitting the correct replacement collets restores the system to factory spec and keeps everything secure under heat and vibration.

Key Features

• Correct collet lock ring for the Norton Commando 850 MK3 balanced pipe exhaust system
• Part number: 065260 – sold per side (one required per cylinder)
• Secures the balance crossover tube between the exhaust headers
• Restores factory fit and function to the balanced pipe system
• Sourced from Norvil – the definitive Norton Commando parts authority

Compatibility

• Norton Commando 850 MK3 (1975) – Balanced pipe exhaust system only

If your balanced pipe system is loose or rattling, these collet lock rings are the place to start. Fair Spares New England is your trusted U.S.-based Norvil distributor for classic Norton parts — order with confidence.