Cylinder -EGIG PERFORMANCE cast iron 170 ccm - Vespa PV125, ET3 125, PK125

EGIG 170cc cylinder kit for Vespa Smallframe with 115 mm connecting rod

for Vespa Smallframe V50, V90, PV, ET3, PK

The EGIG 170cc cylinder kit for Vespa Smallframe consists of a cylinder and crankshaft. This has an extra-long connecting rod (115 mm instead of 97 mm as standard on models from 80cc). This allowed the transfer port area to be moved from the engine block to the cylinder. This means that no milling work is necessary, neither on the cylinder nor on the housing, for a high mixture flow rate. In addition, the special connecting rod ratio of 0.44 (stroke to connecting rod length) means that the long connecting rod runs particularly smoothly and puts little strain on the piston skirt.

This means that even a 50cc standard engine can be upgraded to 170cc for touring and everyday use with the cylinder and crankshaft. Depending on the exhaust and carburetor used, the power at the rear wheel is then around 20-25 hp and up to 24 Nm (without milling work on the engine or cylinder, with reed valve inlet on the cylinder).


NECESSARY MODIFICATIONS
The only necessary modification to the engine housing is to lower the edge of the housing that rises above the sealing surface on the cylinder base of the engine. This is lowered to 2 mm (file/Dremel is sufficient, it is not necessary to plan right down to the sealing surface).

The cylinder is assembled together with the EGIG 170 crankshaft as a diaphragm-controlled engine. This means that the intake for the mixture is handled automatically via a diaphragm box bolted to the cylinder. No timing (as with the rotary valve) has to be observed. Alternatively, however, intake control can of course also be implemented via the engine housing. If this is to be done via the standard rotary valve, EGIG offers a crankshaft with rotary valve cheek.

• Displacement: 170cc

• Stroke: 51 mm

• Bore: Ø65mm

• Connecting rod length: 115 mm

• Number of overflow channels: 6

• Exhaust shape: One-piece

• Exhaust width: 66 % of the bore

• Control angle: 126°-185°

• Cylinder material: Gray cast iron

• Number of piston rings: 2

• Intake control: Direct (on cylinder)

• Alternative: Intake via housing (diaphragm or rotary valve)

• Virtually no milling work required on the housing

• Distance between stud bolts on intake manifold: 54.5 mm

• Stud distance at the outlet: 56 mm

• Cylinder stud bolt length: min. 155 mm

• Outputs of over 25 hp and 24 Nm are possible without milling work

• Recommended mixing ratio oil/petrol: 1:33 (e.g. Motul800)

Due to the one-piece exhaust and its overflow layout in combination with a relatively large displacement (for a Vespa smallframe engine), the cylinder is a real torque beast. Even with an original gearbox (with standard 4th gear) and an already long 2.46 primary (original for 125cc is 2.56), accelerating from 35 to 135+km/h without a power hole is no problem. This was tested in conjunction with the EGIG Superbanana Sport tested.