Norton Commando 850 Piston Set +.020 Oversize – AE Hepolite 06-4041 / 19342

Keep your Norton Commando 850 engine running strong with this Norton Commando 850 piston set oversize +.020″ (77.50mm) — genuine AE Hepolite Piston Set, +.020 oversize — the trusted British-made replacement for worn or rebored 850cc Commando cylinders. This is the complete pair of cast pistons manufactured by AE (Associated Engineering), the original equipment supplier to the Norton factory, sold under both the Hepolite and AE brand names.

Each set is matched for consistency and is designed specifically for the Norton Commando 850cc twin-cylinder engine used from 1973 through 1977. With a bore size of 77.50mm (+.020″ oversize) and a compression ratio of 8.5:1, these pistons restore proper compression and performance after a cylinder rebore to the first oversize.

What’s Included

• Two (2) matched cast pistons
• Piston rings (complete set)
• Gudgeon pins (wrist pins)
• Circlips

Specifications

• Part Number: 06-4041 / AE 064041
• Hepolite Number: 19342
• Oversize: +.020″ (77.50mm bore)
• Compression Ratio: 8.5:1
• Construction: Cast
• Quantity: Pair (2 pistons)
• Fits: Norton Commando 850cc (1973–1977)

Compatibility

These pistons fit the following Norton Commando 850cc models:

• Norton Commando 850 Roadster (1973–1977)
• Norton Commando 850 Interstate (1973–1977)
• Norton Commando 850 Mk2 / Mk2A / Mk3
• Norton Commando 850 Hi-Rider
• Norton Commando 850 John Player Replica

A must-have for any serious Commando engine rebuild. If your cylinders have been bored to the first oversize, these AE Hepolite pistons are the correct factory-specification replacement. Sourced directly from Norvil Motorcycle Co. in the UK — the world’s largest supplier of Norton Commando parts — and distributed exclusively in the United States by Fair Spares New England.