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The descriptions and illustrations in this booklet are not to be taken as binding on the Manufacturer. The essential features of the model described and illustrated herein remaining unaltered, the PIAGGIO Firm reserves therefore the right to carry out at any moment, without being obliged to bring this booklet up-to-date in due course, modification that may occur concerning machine units and parts, or delivery of accessories, that the Firm deems to be convenient on improvement purposes or for what may concern manufacturing or commercial requirements. TECHNICAL DATA Stamping on frame (1) – Stamping on engine (2), Serial numbers with prefix VBB are stamped on both frame and engine in the positions indicated on Figs. 2 and 3 respectively. Section of engine 1. Air cleaner and carburettor - 2. Piston - 3. Crank shaft - 4. Clutch - 5. Mainshaft with gear pinions - 6. Gear shifter - 7. Flywheel magneto - 8. Kick-starter -9. Crankcase arm (clutch side), pivoted to the frame. Fig. 5 - Ignition diagram 1. Ignition coil in flywheel magneto - 2. External H. T. coil - 3. Rotor cam - 4. Breaker - 5. Condenser - 6. Sparkplug - 7. Engine cut-out on switch. Such numbers and prefixes identify the Vespa as prescribed by law and are repeated on the test card and other documents of the Vespa. They must be quoted when ordering spares. The engine is pivoted to the chassis of scooter through the cylindrical arm of the crankcase half, clutch side, provided with a spindle and two bushes (see Fig. 4). Its vibrations are damped by the rear suspension with variable rate coil spring and hydraulic damper (see also page 13 ). The rear wheel is secured to the end of the mainshaft. Feeding circuit 1. Fuel cock lever with sediment trap: A) Reserve, B) Open, C) Closed - 2. Float - 3. Air cleaner with carburettor - 4. Air vent for starter device - 5. Set screw for throttle slide - 6. Throttle slide - 7. Air vent for main jet - 8. Hole on mixer top - 9. Mixer - 10. Main jet - 11. Idling jet - 12. Air vent for idling jet - 13. Plug for inlet hole for oil; for laying up. - 14. Idling adjuster - 15. Valve for starter device - 16. Intake port - 17. Transfer ports - 18. Exhaust duct. By means of kick-starter, night hand side of scooter. The multiple gear and consequently the engine is set in motion through a ratchet sector and a gear by operating the kick-starter. WIRING. For access to the engine, take off the engine bonnet: proceed as follows. - Pull the lever « 1 » (Fig. 16) and turn it so as to release it from the bonnet. Then move the bonnet slightly outwards, until front dowel « 2 » disengages from the hole on the frame.
Tags : half clutch, hydraulic damper, clutch side, sediment trap, vespa 150, air vent, set screw, improvement purposes, manual content, kick starter, crankcase, coil spring, test card, flywheel, vbb
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