S p e c s:

1961
Made under license in England
engine: single cylinder, air cooled 2-stroke
induction: disc valve
bore: 57 mm
stroke: 57 mm
cubic capacity: 145.45 cc
compression ratio: 6.5: 1
bhp at rpm: 5.5 @ 5,000
lubrication: 2% oil
transmission: 4 speed constant mesh
1st gear: 13.35: 1
2nd gear: 9.32: 1
3rd gear: 6.64: 1
4th gear: 4.73: 1
clutch: wet - 3 cork plates
carburetor: Dell 'Orto SI/20/17B
main jet: 100
diffuser: BE/1
main air bleed: 185
throttle valve: No.7
pilot jet: 185
*SI/20/17C from engine #5KC11726
main jet: 100
diffuser: E/1
main air bleed: 185
throttle valve: No.0
pilot jet: 185
starter jet: 60
 
ignition: contact breaker & coil
ignition timing: 28 degrees BTDC
breaker gap: 0.3 - 0.5 mm
voltage: 6 volt AC
battery: 6V 9ah
wheels: 8"
tires: 3.50 x 8"
 


Thanks to M.W.R Jolliffe for the image above.
This bike is essential the same as the Italian VBB1T but was manufactured and assembled in Britain under license and was offered in colors other than the only Italian option of metallic blue.