V9A Vespa 90
Frame V9A1T · 1963–1984 · Small frame
Engine
TypeSingle cylinder, air cooled 2-stroke
InductionDisc valve
Bore × stroke47 mm × 51 mm
Displacement88.5 cc
Compression ratio7.2 : 1
Power3.1 bhp @ 5,200 rpm
Lubrication2% premix
Transmission
Type3 speed constant mesh
Primary drive22/63
1st gear17.18 : 1
2nd gear9.66 : 1
3rd gear6.12 : 1
ClutchWet, multiplate
Carburetor
CarburetorDell'Orto SHB 16/16
Main jet63
Slow-running jet38
Starter jet50
Ignition & Electrical
IgnitionContact breaker & coil
Timing19° BTDC
Breaker gap0.3–0.5 mm
Stator output6v - 30w
System6 volt
Wheels & Tires
Wheels10″
Wheel hubsPressed steel
Tires3.00 × 10