Norton Commando 850 Stainless Exhaust Lockring – Balanced Pipes (063988)

<p><strong>Norton Commando 850 exhaust lockring</strong> 063988 is the correct stainless steel retaining lockring for the Norton Commando 850 MK3 balanced pipe exhaust system. Machined in stainless steel for superior corrosion resistance over the original steel item, this lockring threads onto the exhaust port and locks the pipe header firmly in place — eliminating the loosening and leaking that plagues worn or corroded originals.</p><p>The balanced pipe system was introduced on the 850 Commando to improve exhaust scavenging and mid-range power delivery. It connects the two cylinders via a crossover balance tube, and the correct lockrings are essential to maintaining a gas-tight seal at each cylinder head. An exhaust leak at the head not only causes power loss and a characteristic ticking noise, but can also discolor the engine cases with carbon deposits. This stainless lockring resolves that cleanly and permanently.</p><h2>Key Features</h2><ul><li>Stainless steel construction – superior corrosion resistance over original spec</li><li>Correct fit for the Norton Commando 850 balanced pipe exhaust system</li><li>Part number: 063988</li><li>850 Commando MK3 fitment only – not for standard twin-pipe systems</li><li>Sourced from Norvil – the authoritative Norton parts supplier</li></ul><h2>Compatibility</h2><ul><li>Norton Commando 850 MK3 (1975) – Balanced pipe exhaust system only</li></ul><p>If you’re rebuilding the exhaust system on an 850 MK3 Commando with balanced pipes, this is the correct lockring to have on the bench. Fair Spares New England is your trusted U.S.-based Norvil distributor – order with confidence and get your classic Norton running right.</p>