48 mm replacement piston with a 1.5 mm rectangular piston ring with internal locking (IS) for mopeds equipped with a 48 mm Athena cylinder kit compatible with Sachs 504 / 505 models with or without a diaphragm.
You can find the detailed dimensions of the piston according to the technical drawing in the product details. You can also find information about common piston rings, their clearance, and retaining types in the legend accompanying the images.
Tolerance type: B
The piston kit includes a piston pin, piston clips, and piston rings.
Note: Please observe the installation direction during assembly. The piston is installed with the arrow pointing toward the exhaust on the exhaust side.
You’ll find the appropriate installation tools, piston pin retainers, and, if necessary, the corresponding cylinder among the accessories.
A quality product from the Italian manufacturer Athena.
| Nominal diameter | 48 mm |
| Manufacturer | Athena |
| Ø outside piston (A) | 47.96 mm |
| Compression height (C) | 30.12 mm |
| Curvature (D) | 1.94 mm |
| Total piston height (E) | 59 mm |
| Number of piston rings (F) | 1 pcs |
| Piston ring mold | Rectangular ring |
| Piston ring impact | Internal fuse (IS) |
| Piston ring height | 1.5 mm |
| Ø piston pin (B) | 12 mm |
| Tolerance group | B |
| Weight piston kit | 123 g |
| Sachs | 504 (without pedal shaft) 505 (with pedal shaft) - 1A (AT) , 2A (HG) |
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