Norton - JPN replica
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Norton D2-492-25-16
Photo ou archives :
2516

Capacity : 828
Model : JPN replica
Production : 1975 - 1975
Category : (R) Street Bike
   

NORTON

850 john Player Norton Replica· 1975

Road bike, track style

Rider/tuner Peter Williams joined Norton in 1969 and began developing a 750cc production racer using a power unit developed from the Commando twin. It first appeared in the 1972 Tourist Trophy, but was eliminated because of gearbox failure. For 1973, an entirely new machine with a monocoque frame/ tank was developed, which gave Williams a well-deserved TT win.

From Reality to Replica

Flushed with its racing success, Norton launched an exclusive run of 750 Production Racers, replicas of the works john Player Norton team bikes, to be sold to private entrants. The next move was far more commercial; late in 1974, Norton unveiled a production John Player replica intended to add sparkle to an aging model line-up.

Aerodynamic Style

The dolphin fairing, whose style was as stunning as it was aerodynamic (its drag coefficient was just 0.39), was a faithful copy of the racer. It incorporated, as on the 1973 Bol d'Or machine, dual headlamps in the blisters that shrouded the drop handlebars. The effect was magnificent. That year, Norton abandoned the racing 750, which developed 80 hp at 8000 rpm, in favor of a 60 hp, 828cc, bored-out version of its standard engine. It

was this unit that was fitted in the ]PN replica. There were further compromises: the replica had neither the light-alloy rims nor the rear disc brake of the racing machine. But did it really matter? The JPN replica was reasonably priced and a delight to ride.

SPECIFICATIONS

Engine: 828cc (77x89mm) air-cooled twincylinder four-stroke; "Isolastic" engine mounting

Power Rating: 61 hp @ 5900 rpm

Valves: overhead-camshafts

Fuel System: two Amal carburetors

Transmission: 4-speed, chain final drive

Suspension: relescopic forks (front); swing arm (rear)

Brakes: disc (front); drum (rear)

Wheels: 4.10x19 inch (front & rear)

Weight: 437 lb

Maximum Speed: 121 mph

Seen here at the famed Montlhery banked circuit south of Paris, the Norton John Player Replica is today a valued collector's piece.


Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at info@moto-collection.org for conditions and copyright.





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François-Marie Dumas

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