OEM-Qualität Item number: 3330557
OEM-Qualität
6 Ratings
159,00 €*
available immediately
Shipping weight 3,82 kg

OEM 125 cc cylinder with 3 channels for Vespa PV and PK

This is a very successful reproduction of the original cylinder of the performance-enhanced Vespa Primavera, the ET3 (as well as the later PK125 models). The designation ET3 stands for electronicignition and 3 transfer ports(Travasi 3). This is the most important improvement over the two-channel cylinder. The third overflow channel (also called boost port) helps to achieve significantly better performance. Most recently installed in the PK ETS, Piaggio states a whopping 97 km/h as the top speed for this model. All this with a 20 mm carburettor and normal crankshaft.

  • Bore: Ø55mm
  • Stroke: 51 mm (std.)
  • Displacement: 121ccm
  • Exhaust stud bolt: M8x1.25
  • Stud bolt distance exhaust: 56 mm (like original PK125)


This well-made and solid cylinder is recommended as a high-performance replacement for the original cylinder of the Primavera models or as a stable and superior tuning for the 50cc models. Of course, these then require additional components from the 125cc version: crankshaft, cylinder cover, stud bolts, cylinder head, carburetor, transmission, exhaust.

Conclusion: The ET3 cylinder is the perfect way to build a stable and fast engine that has nothing to hide with its performance. This cylinder is also supplied with pistons, piston pins, piston rings and piston pin clips. Piston rings 2x1.5 mm. Exhaust studs (not included).


NOTE:
The cylinder already has the modern hole pattern for Vespa PK exhaust systems (8 mm studs with 56 mm spacing). Original PV/ET3 exhaust systems still use a distance of 52 mm. The manifold should be adapted accordingly (when using original ET3 exhaust systems) or a suitable aluminum manifold should be used (when using original PV125 exhaust systems). Modern exhaust systems usually already have a suitable manifold.

This is how we ensure, that reviews come from real consumers.
Andreas K. from Sundern 09/23/2025
Anonym  11/05/2014

Alles Top!

Anonym  10/16/2016

Super !

Anonym  07/19/2019

I hope this cylinder help to quick respon my vespa

Anonym  08/12/2023

Good stuff.
This cylinder kit can be used almost as is. Some minor adjustments, such as chamfering, are necessary before installation. Note that the exhaust stud width is different from ET3.

Richard W. from Sonthofen 08/31/2025
General
Performance class
Standard
 
Piston pin
Diameter
15 mm
 
Cylinder
Drill hole
55 mm
Type of cooling
luftgekühlt
Displacement
121 cm³
Motor type
2-Takt
Material
Grauguß
Piston raceway material
Grauguß
Cylinder gasket set included
ja
Cylinder head included
nein
Outlet shape
1-teilig (oval)
Exhaust assembly
Flansch
Flange type
2-Schrauben
Distance between exhaust studs
56 mm
Threaded exhaust studs
M8
Number of boost ports
1
Number of transfers (incl. boost ports)
3
 
Crankshafts
Stroke
51 mm
 
Piston
Number of piston rings
2
Piston manufacturing method
gegossen
 
Piston rings
Piston ring type
Rechteck-Ring
Piston ring thickness
1,5mm
 
Piston clips
Piston clip type
Seeger-Typ
 
OEM numbers (for comparison purposes only)
Piaggio:
151981, 197592, 243473, E.3950, E.8319, E8319
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