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Piston -GRAND SPORT Race- Vespa Polini 133 cc - 57,0mm

partnumber GL117

Grand Sport conversion piston for Polini and DR cylinder kits with 133 cc.

Up to date piston design with an 18 % SI ratio, 2 very hard 1 mm thin piston rings. The piston skirt has a cutout. The cutouts for teh piston transfer passages have to be modified by yourself, according to your cylinder.

The piston is coated (Molybdenum/Molybdaen) for excellent operation after lubrication-system failure, reduction of friction and a perfect smoothening of piston and cylinder wall.

The cylinder has to be modified for the different compression height of the piston (compression height of Polini and DR cylinders are 36 mm).
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