JPN Replica

The PWM JPN Replica recreates the iconic 1973 John Player Norton ‘Monocoque’ raced by Peter Williams and Dave Croxford. Just 25 examples of the replica will be created to commemorate Williams’ victory at the 1973 Isle of Man TT Races. The JPN replica is a sympathetic evolution of the TT winning bike which brings some of the details up to date whilst retaining the authenticity and character of the seminal race bike.

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Only 4 JPN Monocoques were ever built (plus one prototype), largely due to the labour involved in hand building the complex frame- each one taking around 12 man weeks. Using modern CAD techniques and manufacturing processes, Peter Williams Motorcycles have developed a frame faithful to the original but able to be produced in a fraction of the time.

Where possible original tooling has been used to create new parts, such as the distinctive cast magnesium wheels developed by Peter to accommodate the, at the time, revolutionary disc braking system. If tooling or drawings were not available then, thanks to Mike Braid and the National Motorcycle Museum, two of the original bikes have been made available for reference and digitisation using a FARO arm. Original parts have been reverse engineered in CAD to create new items to the correct specification under Peter’s watchful eye.

With anticipated start of production in Summer 2013, the 25 replicas will feature a host of bespoke parts and developments to improve performance and reliability.

Based around a stainless steel replica of the famous JPN ‘monocoque’ frame, each bike will feature a ‘Mick Hemmings’ built Commando 750cc air cooled parallel twin, incorporating the Peter Williams designed PW3 camshaft, linked to a Quaife 5-speed gearbox.

Mick Hemmings EngineMick Hemmings is renowned worldwide for the quality of his work. After successfully racing his Commando in the early 1970s (30+ wins) Mick, alongside wife Angie, opened his shop specialising in the preparation of Triumph and Norton racing machines and the manufacture of ‘Norvil’ race parts. Returning to racing in the mid-80s Mick had not lost his touch and won EVERY CRMC race he entered.

He has since become one of the world authorities on Norton engine building and tuning, with his own parts and modifications improving performance and reliability for either road or track use. We believe Mick’s engine to be the very best available, with the parts backup and service to match.


Other bespoke parts include cast Magnesium wheels which have been manufactured from original tooling. Cast Magnesium fork sliders and disc brakes have been recreated from original drawings along with the distinctive ‘outrigger’ clutch.

Each replica will be fitted with a numbered plaque, and issued with a certificate of authenticity signed by Peter. There are no plans to build more than the batch of 25 bikes, for details on the ordering process and to register your interest in this unique opportunity please click the link below.

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