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- Vespa Classic
- Cylinder head -MALOSSI Ø57.5mm, 136 ccm, MK4, MHR- Vespa PV125, ET3 125, PK125
High-performance cylinder head for the 136 cc MALOSSI Smallframe cylinders. The head is designed for the current 136 series (MK4 grey cast iron and 136 MHR aluminium) and combines an optimized combustion chamber geometry, generously dimensioned cooling surfaces and a modern O-ring seal. Ideal as a replacement head or as a basis for custom machining on Vespa PV, ET3 and PK engines with 57.5 mm bore.
For MALOSSI 136 ccm MK4 / MHR Ø57.5 mm smallframe Viton O-ring seal Long thread spark plug
MALOSSI uses a special die-cast aluminum alloy for the 136cc head. The cooling fins are not only pronounced on the outside, but also on the underside and increase the heat dissipation surface. Production takes place on high-precision CNC machines with diamond-tipped tools. The result is very tight tolerances and a flat, resilient sealing surface for high thermal loads.
Sealing takes place via an embedded Viton O-ring, which sits in a circumferential groove. This eliminates the need for the classic head gasket made of metal or fiber, the system is insensitive to settling and can be reproducibly sealed even after several disassemblies.
The combustion chamber has a hemispherical design and works with a centered squish band. The spark plug is positioned centrally, which supports fast and even flame propagation. This increases the knock limit, the torque in the mid-range increases and the separation behavior of the engine remains cleanly controllable.
In combination with the respective cylinders, the following guide values result for the compression ratio (with MALOSSI basic configuration, depending on the squish edge and base gasket):
Changes to the base gasket, head gasket or timing can change these values. For sporty setups, we recommend checking and documenting the actual squeeze edge on the assembled engine.
