S p e c s: VSC1M motor
induction: piston ported
bore: 62 mm
stroke: 60 mm
cubic capacity: 181.15 cc
compression ration: 7.7: 1
bhp at rpm: 8.7 @ 5750
con rod length: 110 mm
piston compression height: unknown
piston type: domed
small end diameter:unknown
big end diameter:unknown
flywheel side bearing: 25x52x15
drive side bearing: 25x62x12
input shaft bearing: 12x37x17
output shaft bearing (flywheel side): Piaggio only
rear wheel bearing: 20x52x15
flywheel side inner oil seal: 52x32x5
flywheel side outer oil seal: 24.9x45x6.5
drive side oil seal: unknown
rear hub oil seal: 30x40x7
The casings are only
shared between the SS180 and the GS160 models although they look
similar to other casings.
Bearings: Most bearings are easy to come by with
the exception being the Piaggio specific output shaft on the flywheel
side. This bearing is located just inside the selector box and is
specific to the GS160 and SS180.
Cranks: The crank is specific to the GS160.
The standard VSB1M barrel is a two
port design with a piston ported intake. The SS180 barrel and piston is
the only option for a larger capacity.
there are not really any options except for the SS180 conversion noted
Ignition: The original 6V points system cannot be replaced
without significant work to the flywheel of another model.
if any other gearboxes can be installed but I assume the SS180 could be.