Chopper Merlin -
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Chopper Merlin D2-492-06-20
Photo ou archives : E. Courly

Capacity : 4000
Model :
Production : 1991 -
Category : (R) Street Bike


4 500 cm3 Rolls Royce - 1991

If Rolls Royce only knew…

"Even in the United States, home of the fire breathing monster dragsters, where big is the status quo, this amazing Australian built bike caused a sensation. The formula was simple, just take the 27 litre V12 Rolls-Royce Merlin Engine from a World War II fighter plane, cut off the first row of cylinders, and spend the next few thousand hours putting this hulking v-twin on two wheels!

The Merlin is ‘The World’s Biggest Motorbike’ but getting your name in the Guinness Book of World Records is becoming increasingly difficult. Lucky Keizer, the Australian creator of this wild ride, qualifies as the builder of the motorcycle with the world’s largest engine.

This is a road monster; nothing like it has been seen since the early days of motorcycling. The last time is when the French Buchet company in 1902 built a monstrous vertical twin engines and mounted the 4245cc engine in a tricycle and a 2280cc engine on two wheels, or when young James Scripps-Booth, son of the owner of The Detroit News, built his astounding 6307cc V8 "Bi-Autogo” in 1912.


Engine: 4500cc (137x152mm) water-cooled V -twin four-stroke

Power output: 150 hp

Valves: single overhead camshaft driven by cogged belts, 4 valves per cylinder

Fuel system: dual-choke downdraft carburetor and Fisher supercharger

Transmission: primary and secondary chive by chain

Suspension: (front) telescopic forks; (rear) rigid

Brakes: (front) twin ventilated discs; (rear) disc

Wheels: cast aluminum

The 3200 lb moto-titan still survives in the city where it was built. It was a totally impractical dead-end two-wheeler design that needed retractable outrigger wheels to stay upright at speeds under 20 mph. Still it was America’s first V8. The monstrous Merlin would win no beauty contests, but for sheer muscle there’s nothing else quite like it!

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 for conditions and copyright.

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François-Marie Dumas

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