Cylinder -POLINI 75 ccm Racing- Vespa V50 (1st series - cylinder base Ø=56,8mm) | Cylinders | Cylinder | Engines

Preview: Cylinder -POLINI 75 ccm Racing- Vespa V50 (1st series - cylinder base Ø=56,8mm)

Description

Cylinder kit 75cc Polini Racing suitable for Vespa V50 1° series.

Early Vespa V50 models, colloquially called V50 first series, are in many details different from the later V50 models.

V5A1*1001* to *92877
V5SA1*1001* to *15325*

The first series models are easily recognizable by a very small engine cover (only about one hand width high) as well as their 3 gear transmission and the small 9 inch tires.

The engine of these early 50cc Vespa models, in combination with a factory long primary reduction of 3.72 and a big jump from gear 2 to gear 3, is too tired for today's everyday use.

The long transmission ratio makes the engines almost predestined for an increase in displacement by means of a larger cylinder. However, the early V50s have a smaller cylinder base bore in the engine housing, so the well available cylinders of the later models do not fit here.

To avoid disassembling the engine we offer a suitably machined cylinder. It replaces the old cylinder 1:1.

Our choice was the Polini 75ccm in the racing version. With a very nice speed range and a power of over 4hp, it is exactly the right candidate to pull the long gearbox of the V50. The wide speed range helps to overcome the long jump from second to third gear. In our cylinder kit you will find a sheet metal nut M6 as an accessory, this serves to create the screw connection between the fan cover and the cooling hood and can be simply put on the fan cover. This is necessary because the mounting points of the V50 1° are oriented differently.

Polini gives an ignition point of 17° for this cylinder. If you still use a contact ignition on the engine, you can adjust the ignition timing with the test lamp to 1.4mm before TDC.

Either after exhaust and if a racing shaft is installed in your engine, you should adjust the main jet in the carburetor accordingly. Polini recommends a main jet of 66-68 for the SHB 16 carburettor in the installation instructions, but we cannot confirm this value. According to experience the carburetor should be equipped with a jetting of 74-84.

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€199.00 *

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General
performance class:	sport
Gudgeon pins
diameter:	12 mm
Spark plugs
thread type:	M14x1,25
thread spark plug:	long
heat rating NGK:	B8ES
Cylinders
displacement:	75 cm³
bore:	47 mm
engine type:	2-stroke
type of cooling:	air cooled
material:	cast iron
material piston cylinder surface:	cast iron
cylinder head inclusive:
cylinder gasket set inclusive:
number of transfers (incl.boost ports):	6
number of boost ports:	2
shape exhaust port:	single port (oval)
exhaust mounting:	flange
flange type:	2 studs
Crankshafts
stroke:	43 mm
Pistons
number of piston rings:	2
production method piston:	cast
Piston rings
piston ring type:	common ring
thickness rings:	1,2mm
Circlips
circlip type:	double G-type
wire size of circlip:	1,0mm
Cylinder heads
cylinder head type:	one piece
OEM numbers (for comparison purposes only)
Polini	10520098, P10520098

Please inform me once the product is available again.

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