S p e c s:

1956 - 1958
Made under license in France
engine: single cylinder, air cooled 2-stroke
induction: piston ported
bore: 58.5 mm
stroke: 54 mm
cubic capacity: 146.15 cc
compression ratio: 6.5: 1
bhp at rpm: 6.2 @ 5,500
lubrication: 5% oil
transmission: 4 speed constant mesh
1st gear: 13.3: 1
2nd gear: 8.7: 1
3rd gear: 6.2: 1
4th gear: 4.8: 1
clutch: wet - 3 cork plates
carburetor: Zenith MX.20
venturi diameter: 24mm
main jet: 94
idle jet: 35
ignition: contact breaker & coil
ignition timing: 28 degrees BTDC
breaker gap: 0.6 mm
voltage: 6 volt AC
battery: n/a
wheels: 9" - weird but true!
tires: 3.50 x 9"
top speed: 53 mph / 85 kph
 
 ACMA 150GL links:

Note: ACMA produced Vespas from 1951 to 1962 in Fourchambault, near Dijon, France.

The 1956-58 GL differed from earlier ACMAs:

  • The headlamp ring was different
  • The handlebar unit was the same as a Vespa GS150
  • It had a fan cover and fan like the Vespa GS150
  • X style rear rack
  • Square rear light mounted on the license plate
  • Available in grey only (gold was aftermarket).
  • The seat cover made by Brown for 1955 and Gauthier for 1954
  • The seat included a rear handle for the passenger and the springs were internal like the ACMA '55
  • The wheels were 9" and had a four bolt hub bolt pattern.

Thanks to Jean-François Bourque for the info and Greg Holt & Oliver Montuori for the pics (click small images below for larger images). Note: The rear light in the gold bike pictures is not correct for this model.

 Serial numbers for this model are as follows:

  • 1956: 1111 to 5460
  • 1957: 5461 to 9437
  • 1958: 9438 to 15159