The VM1T is the further development of the V33T and has a completely new engine with cross scavenging and the same dimension of 54 mm for piston stroke and bore. The piston has a new, smaller nose shape and in the new cylinder head the spark plug is no longer installed centrally but at an angle of 45°. The intake and exhaust ports of the cylinder are now arranged 90° crosswise (exhaust downwards, intake to the side), previously they were largely next to each other on the luggage compartment side. The 3-speed gearbox is fitted with stronger gears and a larger gearshift cross, the clutch is reinforced from 2/2 to 3/3 cork/steel plates. The new crankshaft no longer has mushroom-shaped cheeks, but round cheeks which enable better balancing.
The flywheel magneto ignition gets a new pole wheel with elongated inspection openings and ignition contacts, which are now easy to adjust with a screwdriver. The fan cover no longer has slots, but is closed except for a central round opening. The aluminum cylinder cover has been reshaped and now encloses the entire cylinder. The toothed kickstarter segment has new dimensions.
The rear brake drum is reinforced with a ring to minimize deformation due to thermal stress. The exhaust tailpipe is now routed straight out on the left-hand side under the luggage compartment jaw; on the V33T it still ran to the rear on the right-hand side under the engine. The middle and rear part of the frame is reinforced. The reinforcement in the upper leg shield bead, as well as the support plate of the leg shield cascade and the rear part of the frame are widened to give the frame greater rigidity. The engine block, which is still made of aluminum, is given a new shape: it is no longer open at the sides, but has seven air slots through which the air for cylinder cooling reaches the fan wheel.
The swinging saddle is more comfortable and equipped with two double conical springs and a chrome-plated grab handle for the passenger. The saddle cover is dark green. The diameter of the headlight on the mudguard has been increased from 95 to 105 mm and the rectangular rear light is wider. The shell-shaped light switch with 3 switch positions plus kill is now made entirely of gray plastic and bears the Vespa lettering in relief on the cover.
The clutch and throttle cables are now routed out of the grommets in the leg shield tunnel and then inside the handlebar tube to the lever or throttle slide. There are minor changes to the clutch and brake levers; the cable nipple is now also located inside the lever mount on the brake lever.
The step bar end pieces are no longer grooved right up to the rivet and now have a small tongue instead, which holds the step bar rubbers better. The rivet heads also have a different, now drop-shaped form. The tank capacity has been increased by 1.25 liters to 6.25 liters compared to the V33T. The total weight of the scooter increases by 1.8 kg.
The VM2T differs from the first model series in only a few details: new Italian road traffic regulations mean that the tank must be fitted with a special cover. Road traffic regulations mean that the headlight must be fitted with a parking light. As a result, the light switch now also has one more switch position and is slightly larger overall. The headlight housing has a red indicator light on the top so that the function of the headlight can be checked at night. The rectangular rear light is again slightly larger and remains the same on all (Italian) models up to 1958. The engine and luggage compartment cheeks are still made of aluminum, but sheet steel may have been used on the last models. (Source: GSF)
Frame numbers by year of construction:
1952: VM1T 1001-8830 (quantity: 7,830)
1953: VM1T 8831-85870 (quantity: 77,040)
Total number of units: 84,870
1953: VM2T 85871-100619 (quantity: 14,749)
1954: VM2T 100620-176014 (quantity: 75,395)
Total number of units: 90,144