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 provides a significant increase in performance.
The intake manifold with diaphragm system for Dell'Orto SHA or PHBG carburetors and exhaust flange is included in the scope of delivery.
Technical data cylinder:
- Connection diameter intake manifold: 19 mm and 24 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: 48.0 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 6.
- 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 carburetor may come into contact with the clutch lever.
Since experience has shown that the steel diaphragm plates supplied can break, we recommend replacing them with carbonite diaphragm plates. You can find these and other suitable parts in the accessories section.
Quality product from the Italian manufacturer Athena.
Details
| Manufacturer | Athena |
| Material | Aluminum |
| Surface | sandblasted |
| Crankshaft stroke | 44 mm |
| Ø cylinder neck | 51.8 mm |
| Nominal diameter | 48 mm |
| Ø Outlet outside | 26 mm |
| Ø Inlet inside | 14.7 mm, 17.8 mm |
| Inlet window | 31.9 x 36.2 |
| Ø piston pin (B) | 12 mm |
| Ø outlet inside | 19.4 mm |
| Thread inlet | M5x0.8 (standard thread) |
| Number of fixing points | 4 pcs |
| Area of application | Tuning |
| Hole spacing outlet | 50 mm |
| Hole spacing inlet | 32.5 mm |
| Outlet type | straight, clamped |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56/60 x 56 |
| 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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Athena piston 48 mm #B | Sachs 504 / 505
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Manufacturer: Athena · Ø outside piston (A): 47.94 mm · Ø piston pin (B): 12 mm · Compression height (C): 30.2 mm · Curvature (D): 1.94 mm · Total piston height (E): 59.05 mm · Number of piston rings (F): 1 pcs · Nominal diameter: 48 mm · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Tolerance group: A · Piston weight: 123 g
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