A conversion to water cooling is a large and complex step in engine tuning.
Some air-cooled cylinders can be equipped with a water jacket. This is actually only possible with aluminum cylinders, e.g. Vespa PX 200 Malossi and Lambretta TS1. These aluminum alloys can be welded very well. More important, however, is the fact that the stud bolt holes lie in a kind of channel from the factory. That they would never come into contact with the cooling water. In the case of cylinders, the open standing pin channels, i. you can see the studs when you look outside through the cooling ribs, it is difficult to get a seal. We can not offer a satisfactory solution for this. If a cylinder is jacketed, the middle cooling ribs are removed 70% and a 1.5 mm aluminum plate is placed around the cylinder. It is necessary to specify where the water connections should be, since a water separation wall must be used. This partition is intended to force the cooling water to circulate once around the cylinder.
Accordingly, both water connections should be close to each other - separated by the partition wall. It is also important to ensure that ventilation is provided at the top or the highest points in the circuit to ensure filling of the circuit. Often a small 8 mm aluminum tube is sufficient, e.g. is placed on top of the cylinder and is closed with a blind plug, depending on the type.