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 manifold must be extended, otherwise the carburettor may come into contact with the clutch lever.
It is well known that the Athena exhaust flange included in the cylinder set can only be fitted with laborious modifications due to incorrect holes and a missing seal. The swiing® exhaust adapter is supplied with a gasket and the matching countersunk screws and solves this problem without any adjustment work.
You will find the aforementioned components for smooth installation along with other items in the accessories section.
Quality product from the Italian manufacturer Athena.
| Nominal diameter | 38 mm |
| Manufacturer | Athena |
| Area of application | Tuning |
| Material | Aluminum |
| Surface | sandblasted |
| Displacement | 50 ccm |
| Crankshaft stroke | 44 mm |
| Ø cylinder neck | 51.7 mm |
| Ø outlet inside | 28.3 mm |
| 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 |
| Number of fixing points | 4 pcs |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) 508 - 1 A |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
Ratings
Accessories & related products
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Athena 38 mm cylinder kit (incl. mounting parts) | Sachs (504), 505, 508
Nominal diameter: 38 mm · Manufacturer: Athena · Material: Aluminum · Surface: sandblasted · Displacement: 50 ccm · Crankshaft stroke: 44 mm · Ø cylinder neck: 51.7 mm · Ø outlet inside: 28 mm · Number of fixing points: 4 pcs · Inlet window: 23.4 x 13 · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 31.5 mm · Ø piston pin (B): 12 mm · Hole pattern [mm]: 56 (61) x 56 · Outlet type: clamped · Outlet type: straight · Hole spacing outlet: 50 mm · Thread outlet: M8x1.25 (standard thread) · Decompressor: M10x1.5 · Camouflaged: No · Area of application: Tuning
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Manufacturer: NGK · Candle designation: BR7EIX · Candle thread type: long · Area of application: High End · Area of application: MX · Area of application: Racing · Area of application: Tuning · Spark plug socket: M4 · Spark plug socket: SAE · Electrode material: Iridium · Suppressed: Yes · Width across flats: 21 mm · Thread type: MF14x1.25 (fine pitch thread)
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