Racing cylinder of the Athena brand for Sachs 504 (with adaptations), 505, 508 & 535 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: 45.0 mm
- Thread for decompressor: M10 x 1.5 mm
The intake manifold and the exhaust flange are included in the scope of delivery.
Note:
Plugs with 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 appropriate countersunk screws and solves this problem without any adjustment work. Please note the installation direction when assembling. The piston is inserted with the arrow pointing towards the outlet on the exhaust side.
| Manufacturer | Athena |
| Material | Aluminum |
| Surface | sandblasted |
| Nominal diameter | 45 mm |
| Crankshaft stroke | 44 mm |
| Ø piston pin (B) | 12 mm |
| Ø cylinder neck | 51.7 mm |
| Ø Outlet outside | 25.9 mm |
| Ø outlet inside | 19.5 mm |
| Ø Inlet inside | 14.3 mm |
| Number of fixing points | 4 pcs |
| Area of application | Tuning |
| Inlet window | 23.4 x 12.6 |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing inlet | 31.5 mm |
| Outlet type | straight, clamped |
| Hole spacing outlet | 50 mm |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56 (61) x 56 |
| Decompressor | M10x1.5 |
| Camouflaged | No |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) , 2B (HG) 508 - 1 A 535 |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
Ratings
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Athena piston 45 mm #A | Sachs 504, 505
Nominal diameter: 45 mm · Manufacturer: Athena · Ø outside piston (A): 44.92 mm · Compression height (C): 28.2 mm · Total piston height (E): 45.2 mm · Number of piston rings (F): 1 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Ø piston pin (B): 12 mm · Tolerance group: A · Weight piston kit: 98 g
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NGK BR8EIX Spark plug long thread interference-suppressed Iridium
Manufacturer: NGK · Candle designation: BR8EIX · Candle thread type: long · Spark plug socket: M4 · Spark plug socket: SAE · Electrode material: Iridium · Suppressed: Yes · Thread type: MF14x1.25 (fine pitch thread) · Width across flats: 21 mm · Area of application: High End · Area of application: MX · Area of application: Racing · Area of application: Tuning
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swiing ingenious exhaust adapter 24 mm Athena cylinder| Sachs 504, 505, 508
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