Racing cylinder of the Athena brand for Sachs 504 (with adaptations), 505 & 508 engines, which were installed on Hercules mopeds / mopeds, among others.
Thanks to the large intake, overflow and exhaust, this tuning cylinder brings a significant increase in performance.
The intake manifold and exhaust flange are not included.
Plugs with long thread must be used.
Technical data cylinder:
- 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
Attention: For the Swiss 504 engines (42 mm stroke), the following modifications must be made to the cylinder:
- Adjust 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.
- For models with an external clutch lever, the intake must be extended, otherwise the carburettor may come into contact with the clutch lever.
Quality product from the Italian manufacturer Athena.
Details
| Nominal diameter | 38 mm |
| Manufacturer | Athena |
| Material | Aluminum |
| Displacement | 50 ccm |
| Crankshaft stroke | 44 mm |
| Surface | sandblasted |
| Ø cylinder neck | 51.7 mm |
| Ø outlet inside | 28.3 mm |
| Number of fixing points | 4 pcs |
| Inlet window | 23.6 x 12.8 / 16.5 |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing inlet | 32 mm |
| Ø piston pin (B) | 12 mm |
| Outlet type | straight |
| Hole spacing outlet | 50 mm |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56/61 x 56 |
| Decompressor | M10x1.5 |
| Camouflaged | No |
| Area of application | Tuning |
Suitable for the following models
| Sachs | 505 (mit Tretwelle) - 1A (AT), 2 A (HG) 508 - 1 A |
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