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Thursday, 21 January 2021

VESPA GS , RARE ENGINE

VESPA GS , RARE ENGINE
  

 VESPA GS
     First 10 models of the "Gran Sport" were produced at the end of 1954, all of these were destinated to exportation. It's only in 1955 that it will be offered in Italy. It will be also knows as "Vespone" (big wasp). It was the first sportive vespa and it will rapidly be the best seller of the brand. The 150cc motor will be introduced during 1954 with a 4 speed manual transmission, a dual seat (able to carry 2 persons). It will also use for the first time 10 inches diameter wheels. With all of theses improvements, The GS model will be able to reach a top speed of 100 km/h. A bulbed legshield on GS will also help to reduce the wind drag.






    Note that this model will never be made in France by A.C.M.A because of a presumed failures prone of the GS model. They made a GL "Grand Luxe" to replace the GS, but finally, GS model will be imported in France soon after.
In 1961, the last 150 GS (VS5) model was fitted with the same tail-light of the 160 GS model.
Last 150 GS models produced were fitted with control cables hidden in the handlebar instead of outside cables on late models.

    Founded in 1955, produced in 5 series until 1961. Motoristicamente inspired by the very first sports scooter Piaggio, Vespa 6 Days, The GS (Gran Sport) is an attempt to make the scooter Pontedera competitive with small light motorcycles period, reaching 100 km / h. The engine compared to contemporary versions on the GS is powered and carburetor directly plugged into the cylinder, the body is tapered for better air penetration. The first model (VS1) is distinguished from other Subsequent to having cables that pass outside of the handlebar. 

    The Gran Sport, or "G.S." 150 was unveiled in 1955, and blended style and speed. The G.S. wasn't the first luxury or sporting scooter, but it was the first to achieve mass market success. It opened the door for the many models and makes of scooters which followed its footsteps.

    There were several versions of the G.S. 150 made. They are commonly referred to by the beginning of the frame number on the scooter. The first G.S.'s frame number began at VS1 in 1955, and the last ended with VS5 in 1961.

    The G.S. represented a substantial upgrade from the truly utilitarian Vespas which preceded it. Indeed, Piaggio had introduced a 150cc version of the Vespa in 1954, but the G.S. 150, began in 1955, was something else entirely. In the U.S., I'm not sure exactly when G.S.'s were first imported to the U.S.. I have seen a handful of VS4's, and quite a few VS5's. If Piaggio imported VS3's, it was not in significant numbers. I do not believe that any VS1 or VS2 were originally sold in the U.S.

    The styling of the G.S. is, without doubt, the pinnacle of Piaggio's scooter design. In my opinion, the body design has never been equaled by any other scooter to leave the Pontadera factory. When you look at it, especially on the later versions which had enclosed cables, it is a smooth and integrated design. It is indeed the height of form and function. As described with the motor above, the G.S.'s styling was everything that the Vespa 150 was, but more. The body was physically bigger, and the cowls' curves were exaggerated and made even more round than those on the Vespa 150. In fact, from the sloped tail to the curved legshields, there is hardly a straight line anywhere on the scooter. Even the floorboards on the G.S. are concave. As on the standard Vespa, the left side cowl was the glovebox, but on the G.S., it also housed a special slim battery and electrical regulator rectifier which were unique to this model. The small space under the gas tank which on the standard Vespa housed the carburetor was retained on the G.S. Now empty save for the fuel filter, it could be accessed through the small underseat door, and also be used for storage. All G.S. 150's came only in metallic silver paint. The horn was of a different design than that on the standard Vespas, and had a stylish shell shape. This horn was later used on many other Vespas.



    The handlebars on the G.S. were enclosed and were aerodynamically styled, as opposed to the exposed chrome handlebars on the Vespa 150. On all the models after the VS1 in 1955, the control cables were totally enclosed in the headset. A version of this headset would later be used on all Vespas after 1958. Also on the headset was an integrated ignition switch, another "luxury" item which was only available on the G.S. at the time of its launch. However the switch's utility was greatly diminished by the fact that all GS's used the same blank key! A speedometer was also standard equipment on the G.S. Early versions had a large square speedometer, while the VS5 had the "clamshell" shaped speedometer that was later used on all largeframe Vespas through the late 1960's.

    The taillights on the VS1-3 were small and square. The taillight on the VS4 and early VS5's was the two lens "acorn" type used on the Vespa 150 which had a red taillight on bottom and an orange stop light on top. On the last VS5's, the taillight was the single lens "acorn" type which had a red lens for both the taillight and stoplight. On the late single lens type, a small reflector was located in the lens. The seat on the G.S. was a dual saddle with which is slightly wider at the front and narrower at the back. The seat included a grab strap for the passenger and was black in color.

VS1T  1955-1955 (#1 series - MK1)

VS1M

ENGINE: 2-stroke 145.6 cc Bore: 57mm. STROKE: 57 mm. POWER: 8 hp at 7500 rpm SAFC: 7:1 TRANSMISSION: 4 Speed, 3-disc clutch trimmed POWER: Ported the cylinder Piston, Dell'orto UB23S3 with air filter WHEELS: 3.50 × 10 SUSPENSION: coil spring conical flexibility and variable Double acting hydraulic shock absorber sull, coil spring coaxial biconical variable flexibility to the rear hydraulic shock BRAKES: drum front (ventilated by 59), rear drum (ventilated by 59) ELECTRIC SYSTEM: Joint 6v AC and DC 6V (6V battery - 12 Ah) AT external coil, alternator and rectifier 32 W LIGHT FRONT: diameter 115 light, lamp biluce 6V - 25/25W Position + lamp 6v - 3W) REAR LIGHT: 6v - 5W (+ 6V - 10W models with brake light) COLOUR: Grey metallic (Code Max Meyer 15005M) RUST: Red Opaque Fund (Max Meyer Code 10055M) TANK: 12 liters including reserve. SPEED: 101 km / h FRAME: VS1T from 001,001 to 0013,300 (year 1955)

VS2T-VS3T  1956-1957 (#2 series - MK2)

VS2M-VS3M

Engine: single cylinder, air cooled 2-stroke barrel: 2 transfer ports induction: piston ported bore: 57 mm stroke: 57 mm cubic capacity: 145.6 cc bhp at rpm: 8 @ 7500 compression ratio: 6.7: 1 carburetor: Dell'Orto UB 23 S3 transmission: 4 speed constant mesh 1st gear: 14.72: 1 2nd gear: 10.28: 1 3rd gear: 7.61: 1 4th gear: 5.84: 1 clutch: wet - multiplate lubrication: 6% carburetor: Dell'Orto UB 23 S3 main jet: 103 mixer: 2.60 needle position: 3 slow running jet: 45 ignition: contact breaker & coil ignition timing: 31 degrees BTDC breaker gap: 0.4 mm voltage: 6 volt max stator output: 6v - 32w wheels: 10" wheel hubs: pressed steel tires: 3.50 x 10 tire pressure (front): 16 psi tire pressure (rear solo): 20 psi tire pressure (rear w/passenger): 32 psi

VS4T  1958-1958 (#2 series - MK2)

VS4M


VS5T  1958-1961 (#3 series - MK3)

VS5M

Price 205,000 Pounds Production 80,000 copies Colors metallic aluminum gray Frame numbers VS5T 47351-127350 Engine Cylinders / time 2-stroke single cylinder Displacement 146.5 cc Bore and stroke 57 X 57 mm Compression ratio 6.7 :: 1 Power / RPM 8 hp / 7500 rpm Torque / revs nd Cooling Forced air Distribution Piston plate 2 transfers Supply UB23 S3 carburettor orchard Mixture 6% Ignition Flywheel Magnet Start Crank Clutch Multiple disc in oil bath Change 4-speed knob Cycling Frame Monocoque Front suspension Pull rod wheel with coil spring and shock absorber Rear Suspension Coil spring and shock absorber Final Drive Direct Wheels Cantilever interchangeable with disk decomposable Front brake Drum 150 mm Rear brake Drum 150 mm Tires 3.50 X 10 front and rear Dimensions and Weight Length 1170 mm Width 700 mm Seat height 800 mm Wheelbase 1180 mm Tank VS2-VS5 9.5 liters Weight 104 Kg Performance claims Speed ​​'maximum 100 Km / h acceleration nd consumption 3 liters / 100 km

Vespa 150gs - VIN numbers; VIN serial numbers; Chassis number


VS1T #1 series - MK1 - VS1T - 1955 -1001 - 13300
VS2T-VS3T #2 series - MK2 - VS2T-VS3T - 1956 -13301 - 23310
                                                                - VS2T-VS3T - 1957 - 23311 - 35310
VS4T #2 series - MK2 - VS4T - 1958 -35311 - 47350
VS5T #3 series - MK3 - VS5T - 1958 - 47351 - 52363
                                                  - VS5T - 1959 - 52364 - 70128
                                                       - VS5T - 1960 - 70129 - 104731
                                                       - VS5T - 1961 - 104732 - 127350

When looking at a potential GS purchase, pay careful attention to the condition of the motor. As mentioned above, all versions have similar motors, but they all are very difficult to source parts for. They are also not easy to work on. This is especially true for a mechanic who is not familiar with their peculiarities. Therefore you can expect that if you are fortunate enough to have a shop willing to work on your G.S. motor, it will be expensive. Unless you are an experienced scooterist or mechanic, it is wise to shy away from a "project" GS. The cost of restoring one can quickly exceed the cost of buying one that is already in good condition

Nevertheless, the G.S. is a wonderful machine to drive. It is very nimble and fast. Even now, 50 years from its debut, comports itself well on today's roads. The design was so far ahead of its time, that it still looks fresh, and its "sporting" motor is fast enough to keep up with modern traffic. As the owner of a G.S. 150 VS5, I can truly say that this scooter is a delight to drive. It is very quick and handles well.


The Vespa story begins in the aftermath of WW II in Italy. The economy was left crippled and the roads were in a disastrous state which made it difficult for the automobile and other manufacturers to reemerge.

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