Milling overflow channels Motor Vespa PX

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The Vespa engine - the heart of Platonica - Has in the last post get the desired control angle of the crankshaft

Adjust cylinder overcurrent channels in the motor to optimize performance

Vespa Tuning: Before the complete assembly of the engine can be done, all the work that generates chips has to be done. Only then can the housing be cleaned.

In the next step, this includes the overcurrent channels of the cylinder in the motor.
The BGM177 is designed in such a way that the cylinder also works perfectly on the original overflow channels.
In our project, however, we use the opportunity to adapt the housing directly. Better filling of the cylinder always means one higher possible torque.

The easiest way to transfer the contour of the overcurrent ducts to the motor housing is to place the appropriate cylinder base seal on the housing and thus transfer the contour to the housing.

The sealing surface is best marked with a foil pen. Then, with the aid of the cylinder base gasket, the Contour of the overcurrent channels marked.

The contour in the motor housing is then adapted with a milling cutter. It is not necessary to mill the channel exactly as deep as in the original motor housing.

The BGM 177 cylinder is designed from the basic construction in such a way that the piston offers a sufficient cross-section.
The generated surface of the adapted channel can be milled and rough. No further polishing is necessary. As long as there are no rough corners and edges, a slightly roughened surface is perfect.

After the channels have been milled and the housing cleaned again, assembly continues ...

Scooter Center Tutorial Vespa PX - Modifying the transfers (activate subtitles)