Athena racing cylinders for Sachs 504 (with modifications), 505, 508, and 535 engines, which were installed in Hercules Prima M, 2, 3, 4, 5, and Optima mopeds, among others.
Thanks to the large intake port, overflow ports, and exhaust port, this tuning cylinder delivers a significant increase in power.
Cylinder Specifications:
- Intake manifold connection diameter: 19 mm and 24 mm
- Inner diameter of exhaust flange: 20 mm
- Exhaust flange connection diameter: 25.7 mm
- Distance between stud bolts on exhaust flange: 50 mm
- Exhaust flange thread diameter: M8
- Cylinder neck diameter: 51.6 mm
- Stroke: 44 mm
- Bore: 48.0 mm
- Thread for decompressor: M10 x 1.5 mm
The intake manifold with diaphragm system for Dell'Orto SHA or PHBG carburetors and exhaust flange is included in the scope of delivery.
Notes:
Spark plugs with long threads must be used.
For Swiss 504 engines (42 mm stroke), the following modifications must be made to the cylinder:
- Adjust the cylinder base and gasket as shown in Figure 6.
- The cylinder base must be turned down so that the compression ratio is readjusted to account for the shorter stroke; we recommend setting a squish gap of 0.8–1.0 mm.
- On models with an external clutch lever, the intake must be extended; otherwise, the carburetor may come into contact with the clutch lever.
- The adapters supplied by Athena do not fit these cylinders, as they only have an M6 hole. We therefore recommend ordering a compatible swiing® adapter.
Since experience has shown that the included steel diaphragm plates can break, we recommend replacing them with Karbonit diaphragm plates.
It is well known that the Athena exhaust flange included in the cylinder set can only be installed with laborious adjustments due to incorrect drill holes and a missing gasket. The swiing® exhaust adapter comes with a gasket and the appropriate countersunk screws and solves this problem without the need for any modifications. Please pay attention to the installation direction during assembly. The piston is inserted with the arrow pointing toward the outlet on the exhaust side.
You can find the components mentioned above for smooth installation, along with other tools, in the accessories section.
A quality product from the Italian manufacturer Athena.
| Manufacturer | Athena |
| Material | Aluminum |
| Camouflaged | No |
| Surface | sandblasted |
| Crankshaft stroke | 44 mm |
| Nominal diameter | 48 mm |
| Ø cylinder neck | 51.8 mm |
| Hole spacing inlet | 32.5 mm |
| Ø Outlet outside | 26 mm |
| Ø outlet inside | 19.4 mm |
| Ø Inlet inside | 14.7 mm, 17.8 mm |
| Number of fixing points | 4 pcs |
| Inlet window | 31.9 x 36.2 mm |
| Ø piston pin (B) | 12 mm |
| Area of application | Tuning |
| Thread inlet | M5x0.8 (standard thread) |
| Hole spacing outlet | 50 mm |
| Hole pattern [mm] | 56/60 x 56 |
| Decompressor | M10x1.5 |
| Outlet type | straight, clamped |
| Thread outlet | M8x1.25 (standard thread) |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) 508 - 1 A 535 |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
Accessories & related products
Athena piston 48 mm #B | Sachs 504 / 505
Nominal diameter: 48 mm · Manufacturer: Athena · Ø outside piston (A): 47.96 mm · Compression height (C): 30.12 mm · Curvature (D): 1.94 mm · Total piston height (E): 59 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: B · Weight piston kit: 123 g
EUR 81.80
Athena piston 48 mm #A | Sachs 504 / 505
Nominal diameter: 48 mm · Manufacturer: Athena · Ø outside piston (A): 47.94 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 · 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: 123 g
EUR 81.80
NGK B9ES spark plug long thread
Manufacturer: NGK · Candle designation: B9ES · Candle thread type: long · Spark plug socket: M4 · Spark plug socket: SAE · Suppressed: No · Width across flats: 21 mm · Area of application: Original · Area of application: Standard · Thread type: MF14x1.25 (fine pitch thread)
EUR 7.70
swiing® ingenious exhaust adapter 26 mm Athena cylinder | Sachs 504, 505, 508
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: galvanized (blue) · Ø mounting hole: 8.3 mm · Ø inside: 22 mm · Ø outside: 26 mm · Width: 43 mm · Height: 25.5 mm · Total length: 67 mm · Hole spacing: 50 mm
EUR 29.50
swiing® ingenious exhaust adapter 24 mm Athena cylinder | Sachs 504, 505, 508
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: galvanized (blue) · Ø mounting hole: 8.3 mm · Ø inside: 20 mm · Ø outside: 24 mm · Width: 43 mm · Height: 25.5 mm · Total length: 67 mm · Hole spacing: 50 mm
EUR 29.50
Explore categories from Cylinder
Moped fans also bought
Motorex engine oil (gear oil) manual 450 ml
Manufacturer: Motorex · Viscosity (SAE): 80W · Area of application: Gearbox lubrication with clutch · Oil type: GL4 · Contents: 450 ml · Gearbox type: Foot control · Gearbox type: Manual gearshift · Temperature resistance (min.): -30 - 220 °C
EUR 12.90
EUR 28.67/l
DMP intake rubber Ø 33.5 / 33.5 x 31.5 with clamps
Manufacturer: DMP · Material: Rubber · Overall length (A): 31.3 mm · Color: black · Ø Passage (B): 30.7 mm · Ø inside (C): 33.5 mm · Ø inside 2 (D): 33.5 mm · Ø outside (E): 46.5 mm · Ø outside 2 (F): 46.5 mm · Ø External connection (G): 46.5 mm · Ø External connection 2 (H): 46.5 mm · Ø Clamping (I): 32.5 mm · Ø Clamping 2 (K): 32.5 mm
EUR 15.30
Cut cable set Black | Sachs Automatic
Manufacturer: Made in Germany · Material: Steel · Quantity: 4 pcs · Ø Stranded wire: 1.25 mm · Ø Stranded wire: 1.5 mm · Ø Stranded wire: 1.8 mm · Total length: 1600 mm · Total length: 1650 mm · Total length: 1850 mm · Total length: 2200 mm · Outer shell length: 1200 mm · Outer shell length: 1250 mm · Outer shell length: 1300 mm · Outer shell length: 2000 mm · Nipple shape: Cylinder · Nipple shape: Pears · Color: black
EUR 26.00
Petrol filter large 6 / 8 mm orange
Material: Paper · Material: Plastic · Ø inside: 4.2 mm · Ø outside: 38 mm · Filter type: Filter paper · Total length: 49 mm · Total length: 108 mm · demountable: No · Color: transparent · Color: white · Color: yellow · Ø fuel hose connection: 6 mm · Ø fuel hose connection: 8 mm
EUR 5.80
NGK B7ES spark plug long thread
Manufacturer: NGK · Candle designation: B7ES · Candle thread type: long · Spark plug socket: M4 · Spark plug socket: SAE · Suppressed: No · Width across flats: 21 mm · Area of application: Performance · Area of application: Racing · Area of application: Tuning · Thread type: MF14x1.25 (fine pitch thread)
EUR 7.70
Working late? Evening hours on Thursday until 20:00
