S p e c s:

1959 - 1962
Made under license in France
engine: single cylinder, air cooled 2-stroke
barrel: 2 transfer ports
induction: disc valve (rotary valve)
bore: 57 mm
stroke: 57 mm
cubic capacity: 145.5 cc
compression ration: 6.5: 1
bhp at rpm: 5.5 @ 5000
lubrication:2%
transmission: 3 speed constant mesh
1st gear: 12.20: 1
2nd gear: 7.46: 1
3rd gear: 4.73: 1
clutch: wet - multiplate
 
BEFORE serial #97500
carburetor: unknown
 
ignition: contact breaker & coil
ignition timing: 28 deg. BTDC
breaker gap: 0.3 - 0.5 mm
voltage: 6 volt
max stator output: 6v - 35w
max speed: 53 mph
 
 
 
Note: ACMA produced Vespas from 1951 to 1962 in Fourchambault, near Dijon, France. I have very little info on this bike but I understand it is almost identical to the Italian Vespa 150 (VBA1T).

Thanks to Jean-François Bourque for the info. If you have any other info please email me.