Motorworld’s newspaper №77
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One of the leading Belgian motorcycle producers was Ateliers Gillet, S.A., a company, which had been delivering its motorcycles to the Belgian military forces, so when in the 1930s requirements were formulated for creating a new military all-terrain motorcycle, it got an order to design its own version. By that time, factory engineers accumulated enough experience in designing 2-stroke engines, so they chose this type of power unit for their new machine.

This is how model 720 AB was developed. The sturdy demountable tubular duplex frame carried a two-stroke engine (728 cc, 22 h.p. at 4000 rpm) with two vertical parallel cylinders. The crankshaft had two toggles turned under the 180-degree angle towards one another. A 4-speed gearbox with additional reverse gear was installed in the same case with the engine on this motorcycle. The rear wheel was driven by a chain-and-sprocket drive, and a torque shaft located inside the rear tune of the sidecar frame went from the rear-wheel center boss to the sidecar wheel.

Gillet Herstal 720 AB

Gillet Herstal 720 AF from «Motorworld by V.Sheynov» collection

 

After 1936 model 720 AB went to batch production. A modification that had minimal differences with the standard version (e.g., a Bernadet sidecar was installed instead of the standard Belgian military sidecar) and was dubbed Gillet Herstal 720 AF was delivered for the French army.

In 1940, due to German occupation of Belgium, the production of model 720 AB was terminated, all manufactured machines were taken over by the Wehrmacht and relevant operational and maintenance manuals were prepared.

Manufacturer Ateliers Gillet, S.A., Herstal (Belgium)
Years of manufacture 1936 – 1940
Quantity produced, units N/A
Price 18 061, 4 BEF
Today’s value 9 897, 92 $
ENGINE AND TRANSMISSION
Type Twin-cylinder, in-line, 2-stroke with vertical cylinder arrangement
Engine capacity, cc 728
Bore and stroke, mm 76 х 80
Engine rating 22 h.p. at 4000 rpm
Sparking N/A
Carburetor Amal
Battery 6V, 70 W
Clutch Multiple-plate, oil-bath
Transmission 4-speed + reverse gear
FRAME AND WHEELBASE
Frame type Tubular, welded, duplex
Front suspension Parallelogram, with frictional damper
Rear suspension Rigid
Brakes Drum type
Wheel size 4,00 х 19
DIMENSIONS
Length, mm
2 492
Width, mm
1 651
Heigth, mm
1 084
Wheelbase, mm
1 500
Ground clearance, mm
   120
Seat height
   752
Mass, kg
   300
Gas tank size, l
     15
Maximum speed, km/h
   110
Range, km
   200