Cylinder kit compatible with your Hercules Prima M, 2, 3, 4, 5, or Optima moped equipped with a Sachs 505, 535, or 504/508 (with modifications) engine.
Thanks to the large intake, the overflow channels, and the exhaust, this racing kit delivers a significant increase in performance.
Contents as shown in Figure 1.
Notes:
- You must always use spark plugs with a long thread.
- For the 504 / 508 engines (42 mm stroke), modifications must be made to the cylinder: Adjust the cylinder base and gasket as shown in Figure 5.
- For engines with a 42 mm stroke, use the thinner cylinder base gasket; for 44 mm stroke engines, use the thicker one.
- On models with an external clutch lever, the intake manifold must be extended; otherwise, the carburetor may come into contact with the clutch lever.
- The included Athena adapters do not fit these cylinders, as they only have an M6 hole. We therefore recommend ordering a compatible swiing® adapter.
We recommend measuring the crimping edge during every cylinder installation, as manufacturing and tolerance variations may occur on the engine case as well as on the cylinder and cylinder head. Please observe the installation direction during assembly. The piston is inserted with the arrow pointing toward the exhaust on the exhaust side.
You can find matching exhaust adapters and other mounting parts in the accessories section.
A quality product from the Italian manufacturer Athena.
| Manufacturer | Athena |
| Material | Aluminum |
| Surface | sandblasted |
| Displacement | 50 ccm |
| Crankshaft stroke | 44 mm |
| Area of application | Tuning |
| Nominal diameter | 38 mm |
| Ø cylinder neck | 51.7 mm |
| Inlet window | 23.4 x 13 mm |
| Ø piston pin (B) | 12 mm |
| Hole pattern [mm] | 56 (61) x 56 |
| Ø outlet inside | 28 mm |
| Thread inlet | M6x1 (standard thread) |
| Decompressor | M10x1.5 |
| Hole spacing outlet | 50 mm |
| Outlet type | straight, clamped |
| Number of fixing points | 4 pcs |
| Thread outlet | M8x1.25 (standard thread) |
| Camouflaged | No |
| Hole spacing inlet | 31.5 mm |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) 508 535 |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
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Athena 38 mm cylinder kit without mounting parts | Sachs 504, 505, 508, 535
Manufacturer: Athena · Material: Aluminum · Displacement: 50 ccm · Crankshaft stroke: 44 mm · Surface: sandblasted · Nominal diameter: 38 mm · Ø cylinder neck: 51.7 mm · Ø outlet inside: 28.3 mm · Inlet window: 12.8 / 16.5 x 23.6 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 32 mm · Decompressor: M10x1.5 · 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 · Number of fixing points: 4 pcs · Camouflaged: No · Area of application: Tuning
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NGK B7ES spark plug long thread
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