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The Vespa G.S. has exceptional features both for sporting and touring purposes, namely: high speed, brisk acceleration, excellent climbing and road holding, and positive braking in all conditions. Besides these remarkable features which have made Vespa models famous all over the world recur in the G.S. : quiet running, weather protection, excellent suspension and seating for a passenger
TECHNICAL DATA - DESCRIPTION
Fuel consumption at economic speed........80 miles per USA gal.
Maximum speed (CUNA standards).......................62 m.p.h.
Max gradient climbable.............................................1 in 3.3
Wheel base..................................................................46.1"
Maximum width on handlebars........................................27"
Maximum length of scooter.............................................67"
Maximum height of saddle............................................31.4"
Maximum height...........................................................41.3"
Ground clearance...........................................................6.3"
Minimum turning circle.....................................................55"
Weight, unladen (full tank).........................................244 lbs.
Fuel tank capacity............................................2.5 USA gals.
Reserve fuel (included)...................................0.44 USA gals.
Operating range......................................................190 miles
ENGINE
Single cylinder, two stroke, with reverse flow scavenge.
Bore............................................................................57mm
Stroke..........................................................................57mm
Displacement............................................................145.45cc
Compression ratio........................................................6.5 to 1
BHP at 7,000 r.p.m.....................................................7.8 HP.
Clutch and gear box
Multiplate clutch, wet type; cork insert plates, interleaved with steel plates; control by lever on left hand side of the handlebars turning in unison with the gear change control twistgrip. 4-speed gearbox with the following ratios:
1st gear 1 : 14.72
2nd gear 1 : 10.28
3rd gear 1 : 7.61
4th gear 1 : 5.87
Both clutch and gear box have adjustable cables.
Ignition
By battery; external ignition coil, with primary circuit fed with d.c. by a 6V - 12Ah battery and not directly by the flywheel magneto.
This ignition system ensures longer service life of the sparkplug and easier starting.
The ignition circuit is controlled by means of a key in the switch on top of handle bar housing.
Sparkplug: Marelli CW240 B or G; CW250 L-T; Champion NA 8; Bosch W240 T2; KLG FE 80; Lodge 2 HLN. {nonsense, use NGK B7 ES-Scott}
Ignition timing with spark advance of 31deg. +/- 1 deg.
Important: To avoid the battery becoming discharged when the engine is switched off, we recommend not to leave the switch key inserted in the running position.
Carburetor
Dell' Orto, type UB 23 S3 with special air cleaner and choke.
Normal maximum jet: 103/100. Idling jet: 50/100
Idling revs can be raised or lowered by adjusting the screw which presses on the carburetor cover.
FRAME
Stressed skin body of pressed steel sheet, with streamlined monocoque type structure.
Handlebars in light alloy.
Steering column, suspension and wheel Handlebars are clamped on top of steering column. The front wheel swinging hub is pivoted at the bottom of the column.
Front suspension with variable rate coil spring and double acting hydraulic damper.
Rear suspension Swinging bracket for engine and rear wheel; variable rate coil spring and coaxial double acting hydraulic damper.
The wheels are interchangeable with rims of pressed steel sheet, @10". Tires of dia. 3.50 x 10".
Brakes Expanding type with cable control. Front: lever on right hand side of handlebars, rear: control pedal on right hand side of footboard.
Drums in light alloy with cooling fins.
Brake adjustment Brakes are properly adjusted if:
-the wheel rotates freely when the respective control lever or pedal are in resting position.
-the braking action starts as soon as respective controls are operated.
These conditions are obtained adjusting the cables by means of screws.
Steering lock A suitable security lock is arranged on the frame, near the handlebars.
We recommend not to lubricate the steering lock, even if it does not function properly.
Do not attempt to ride the machine unless the key is in and remains in the lock and the handlebars move freely.
ELECTRIC WIRING SYSTEM
Either alternating or direct current for both horn and lighting system is supplied as follows.
-Traffic and country beam and tail lamp are directly fed with a.c. by the six-pole flywheel magneto (nominal voltage: 6V)
-Horn, parking lights front and rear, and STOP light are fed with d.c. by a 6V - 12 Ah battery which is recharged by the flywheel magneto through a metallic rectifier.
-Speedometer head is lit by a 6V - 1.5 W bulb fed either with alternating or direct current.
The head lamp, dia. 115mm, lodged in the handlebars is provided with a 25/25W double filament bulb (traffic and country beam), and with a 3W bulb (town and parking light).
The tail lamp with red reflecting glass has a 5W bulb, which also lights the number plate, and a 15W bulb (STOP light) that is operated through a suitable switch when the rear brake pedal is depressed. The main switch where a key must be inserted completely is placed on top of the head lamp.
On the right hand side of the handlebars is installed the dimmer switch (country beam-traffic beam) with horn button.
SETTING THE HEADLAMP
The correct orientation of the main beam can be obtained on both the horizontal and vertical planes, as follows.
--Ensure the front and rear tires are inflated to 17 and 35.5 psi respectively.
--Place the scooter on a level floor in front of a white wall, where a point "O" has been marked, as seen in the figure below.
--Start the engine, hold the throttle control twistgrip at about 1/3 and switch on "country beam".
With two persons on the Vespa, the beam axis should coincide with point "O" on the wall. If not slacken the screws "V", move the lamp as required, then tighten the screw "V" again. This operation can be carried out also with driver only sitting on the saddle. In this case, of course, the beam alignment should be altered whenever the scooter is being ridden by both driver and passenger.
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