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Piston -GRAND SPORT Race- Vespa Polini 133cc - 57.0mm
Part no.:
GL117
Description
Grand- Sport conversion piston for Polini and DR cylinders 133 cc.
Piston with modern layout and 18% Si content , 2 extremely strong 1mm piston rings, piston skirt with cutout, without piston window for self-adjustment.
Coated piston (molybdenum/ molybdenum) with optimal emergency running characteristics, reduction of friction and perfect running-in of piston and cylinder.
Info: the cylinder must be adapted to the new piston and its compression height (compression height Polini/ DR piston = 36mm).
Thanks to the piston rings, widths of 70% are possible with the corresponding exhaust shape. With 57 mm bore, this corresponds to 39.9 mm chord dimension. At 57.5 mm this is 40.3 mm.
The boost port window must still be inserted in the piston. It is best to take the measurement of the original Polini piston. To orient the window in the correct position on the piston, measure from the crown of the piston to the top of the window and transfer this measurement to the piston.
If you use a long stroke shaft, the window must of course be enlarged by the amount of the extra stroke.
Piston with modern layout and 18% Si content , 2 extremely strong 1mm piston rings, piston skirt with cutout, without piston window for self-adjustment.
Coated piston (molybdenum/ molybdenum) with optimal emergency running characteristics, reduction of friction and perfect running-in of piston and cylinder.
Info: the cylinder must be adapted to the new piston and its compression height (compression height Polini/ DR piston = 36mm).
Thanks to the piston rings, widths of 70% are possible with the corresponding exhaust shape. With 57 mm bore, this corresponds to 39.9 mm chord dimension. At 57.5 mm this is 40.3 mm.
The boost port window must still be inserted in the piston. It is best to take the measurement of the original Polini piston. To orient the window in the correct position on the piston, measure from the crown of the piston to the top of the window and transfer this measurement to the piston.
If you use a long stroke shaft, the window must of course be enlarged by the amount of the extra stroke.
AI-translation
This item is currently not available.
€105.17 *
€117.00 *
(10.11% off)
incl. VAT plus shipping costs
The item is ordered and will be in stock soon
P
For this item you get
fidelity point/s
| Gudgeon pins | |
|---|---|
| diameter: | 15 mm |
| length: | 47 mm |
| Cylinders | |
| bore: | 57 mm |
| engine type: | 2-stroke |
| Pistons | |
| number of piston rings: | 2 |
| production method piston: | cast |
| peg position: | top |
| compression hight: | 31 mm |
| shape piston crown: | pulvinate |
| Piston rings | |
| piston ring type: | common ring |
| thickness rings: | 0,9mm |
| Circlips | |
| circlip type: | C-type |
| wire size of circlip: | 0,75mm |
Please inform me once the product is available again.
| Customers alternatively searched for | |
|---|---|
| Kolben | Zylinderkolben | Piston | Pistone | Pistón | Zuiger | | |
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