Photo ou archives : M. Woollett
7904
CLYNO
650 V-twin 4/5 hp - 1912
Double-chain drive
An original feature of the 1912 Clyno V-twin was its two driving chains, one on each side. They were in place of a conventional gearbox, for the final-drive sprockets were of different sizes, one for high speed, the other for low. The rider changed speed with a pedal on the end of the bevel box, where a normal gearbox would have been located.
Stevens Engine
The 644cc engine of this V-twin was made for Clyno (founded in 1909 by cousins Frank and Ailwyn Smith in Thrapston, Northamptonshire) by the Stevens Motor Manufacturing Co. of Wolverhampton.
Increasing Popularity
In 1910, Clyno moved from Thrapston into the recently vacated Stevens Screws factory in Pelham Street, Wolverhampton, where the father of their engine suppliers (soon to establish their own AJS marque) had traded as a precision engineer. With its elegant light gray with royal blue pinstripes and tank panels, the Clyno twin was a machine of great elegance and excellent finish, with many parts such as footboards and gearshift pedal finely cast from aluminum. The long wheelbase adopted by the marque gave the Clyno exemplary stability. The 650 was a favorite with the growing numbers of sidecar riders, inspiring Clyno to launch an improved 750cc version in 1914. That model had a conventional three-speed transmission and became famous during WWI as a motor machine-gun carrier.
SPECIFICATIONS
Engine: 644cc (76x7lmm) air-cooled 55-degree V-twin four-stroke; magneto ignition; total-loss lubrication with hand pump
Power Rating: 6.5 hp (rated)
Valves: side
Fuel System: carburetor
Transmission: 2-speed, double-chain final drive
Suspension: Druid lateral-sprung girder forks (front); rigid (rear)
Brakes: cycle-type rim (front & rear)
Wheels: 3.00x26 inch clincher (front & rear)
Weight: 251 lb
Maximum Speed: 50 mph
The Clyno was one of the best British bikes of its day, with an ingenious two-speed transmission by twin chains selected by a rocker pedal.