These segments fit on the motors Dirt bike, 125cc and 138cc, suitable for piston diameter ø54mm.
the segmentation of an internal combustion engine has the task of sealing the piston in the cylinder. The segmentation helps to ensure even cooling of the piston crown, the transfer of heat to the shirt cooled. You can also spread a thin layer of oil (a few µm) on the t-shirt to limit the wear and tear. Finally, it prevents the return flow of oil in the upper edge of the cylinder.