Piston -GRAND SPORT- Vespa GS150 / GS3 150cc (1959-) - 57.0mm

Grand Sport pistons are special pistons manufactured in small series, with significantly better material properties than their original counterparts.
They are manufactured in Italy and offer the advantage of a higher silicon content (18%) than common pistons. This makes them thermally stable and very durable.

Some special versions also have thin and extremely stable steel piston rings. These have a clear advantage over cast iron piston rings in terms of resistance to breakage, speed and torsional stiffness. A nice feature for cylinders whose exhaust is to be designed much larger.