Racing cylinder of the Athena brand for Sachs 504 (with adaptations), 505 & 508 engines, which were installed on Hercules Prima M, 2, 3, 45 and Optima mopeds / mopeds, among others.
Thanks to the large intake, overflow and exhaust, this tuning cylinder provides a significant increase in performance.
The intake manifold and exhaust flange are not included in the scope of delivery.
Technical data cylinder:
- Distance between stud bolts and 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
Notes:
Plugs with a long thread must be used.
The following modifications must be made to the cylinder on Swiss 504 engines (42 mm stroke):
- Adjust the cylinder base and gasket as shown in Figure 5 .
- The cylinder base must be turned off so that the compression is adjusted again due to the shorter stroke, we recommend setting a crushing edge of 0.8 - 1.0 mm.
- On models with an external clutch lever, the intake must be extended, otherwise the carburetor may come into contact with the clutch lever.
Quality product from the Italian manufacturer Athena.
Details
| Nominal diameter | 38 mm |
| Manufacturer | Athena |
| Material | Aluminum |
| Surface | sandblasted |
| Displacement | 50 ccm |
| Crankshaft stroke | 44 mm |
| Area of application | Tuning |
| Ø cylinder neck | 51.7 mm |
| Ø outlet inside | 28.3 mm |
| Hole spacing inlet | 32 mm |
| Inlet window | 23.6 x 12.8 / 16.5 |
| Ø piston pin (B) | 12 mm |
| Hole pattern [mm] | 56/61 x 56 |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing outlet | 50 mm |
| Outlet type | straight |
| Number of fixing points | 4 pcs |
| Thread outlet | M8x1.25 (standard thread) |
| Decompressor | M10x1.5 |
| Camouflaged | No |
Suitable for the following models
| Sachs | 505 (mit Tretwelle) - 1A (AT), 2 A (HG) 508 - 1 A |
| Hercules | Prima - 2, 3, 4, 5, Optima |
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