Racing cylinder of the Athena brand for Sachs 504 (with adaptations), 505 & 508 engines, which were installed on Hercules Prima M, 2, 3, 4, 5 and Optima mopeds / mopeds, among others.
Thanks to the large intake, overflow and exhaust, this tuning cylinder provides a considerable increase in performance.
Technical data cylinder:
- Ø internal intake manifold: 15 mm
- Connection diameter of intake manifold: 20 mm
- Ø inside exhaust flange: 20 mm
- Ø connection exhaust flange: 25.7 mm
- Distance stud bolt exhaust flange: 50 mm
- Ø Thread exhaust flange: M8
- Ø Cylinder neck: 51.6 mm
- Stroke: 44 mm
- Bore: 38.0 mm
- Thread for decompressor: M10 x 1.5 mm
The intake manifold and exhaust flange are included in the scope of delivery
| Material | Aluminum |
| Surface | sandblasted |
| Nominal diameter | 38 mm |
| Manufacturer | Athena |
| Number of fixing points | 4 pcs |
| Camouflaged | No |
| Displacement | 50 ccm |
| Crankshaft stroke | 44 mm |
| Ø cylinder neck | 51.7 mm |
| Area of application | Tuning |
| Inlet window | 23.4 x 13 |
| Ø piston pin (B) | 12 mm |
| Ø outlet inside | 28 mm |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing outlet | 50 mm |
| Hole spacing inlet | 31.5 mm |
| Outlet type | straight, clamped |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56 (61) x 56 |
| Decompressor | M10x1.5 |
| Sachs | 505 (with pedal shaft) - 1A (AT), 2A (HG) 508 |
| Hercules | Great - 2, 3, 4, 5, Optima |
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Athena 38 mm cylinder kit without mounting parts | Sachs (504), 505, 508
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