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:
- Intake port diameter: 19 mm and 24 mm
- Ø inner 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
The intake manifold with diaphragm system for Dell'Orto SHA or PHBG carburetor and exhaust flange is included in the scope of delivery.
Notes:
Plugs with long thread 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 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 must be extended, otherwise the carburetor may come into contact with the clutch lever.
As experience has shown that the steel diaphragm plates supplied can break, we recommend replacing them with carbonite diaphragm plates.
It is known that the Athena exhaust flange included in the cylinder set can only be fitted with laborious adjustments 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 |
| Camouflaged | No |
| Surface | sandblasted |
| Crankshaft stroke | 44 mm |
| Nominal diameter | 48 mm |
| Ø cylinder neck | 51.8 mm |
| Ø Outlet outside | 26 mm |
| Ø Inlet inside | 14.7 mm, 17.8 mm |
| Inlet window | 31.9 x 36.2 |
| Ø outlet inside | 19.4 mm |
| Thread inlet | M5x0.8 (standard thread) |
| Ø piston pin (B) | 12 mm |
| Hole spacing outlet | 50 mm |
| Hole spacing inlet | 32.5 mm |
| Outlet type | straight, clamped |
| Number of fixing points | 4 pcs |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56/60 x 56 |
| Area of application | Tuning |
| Decompressor | M10x1.5 |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) 508 - 1 A 535 |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
Ratings
Accessories & related products
Athena piston 48 mm #B | Sachs 504 / 505
Manufacturer: Athena · Nominal diameter: 48 mm · Ø outside piston (A): 47.96 mm · Ø piston pin (B): 12 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 · Tolerance group: B · Weight piston kit: 123 g
EUR 81,10
Not in stock
Athena piston 48 mm #A | Sachs 504 / 505
Manufacturer: Athena · Nominal diameter: 48 mm · 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 · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Tolerance group: A · Weight piston kit: 123 g
EUR 81,10
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 · Area of application: Original · Area of application: Standard · Thread type: MF14x1.25 (fine pitch thread) · Width across flats: 21 mm
EUR 7,65
swiing ingenious exhaust adapter 24 mm Athena cylinder| Sachs 504, 505, 508
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: galvanized (blue) · Ø inside: 20 mm · Ø outside: 24 mm · Total length: 67 mm · Height: 25.5 mm · Width: 43 mm · Hole spacing: 50 mm · Ø mounting hole: 8.3 mm
EUR 29,30
EUR 23,40
Explore categories from Cylinder
Moped fans also bought
Motorex engine oil (gear oil) manual 450 ml
Temperature resistance (min.): -30 - 220 °C · Manufacturer: Motorex · Oil type: GL4 · Viscosity (SAE): 80W · Contents: 450 ml · Gearbox type: Foot control · Gearbox type: Manual gearshift · Area of application: Gearbox lubrication with clutch
EUR 12,80
EUR 28,44/l
DMP intake rubber Ø 33.5 / 33.5 x 31.5 with clamps
Manufacturer: DMP · Material: Rubber · Overall length (A): 31.3 mm · Ø Passage (B): 30.7 mm · Ø inside (C): 33.5 mm · Ø inside 2 (D): 33.5 mm · Color: black · 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 15,20
Cut cable set Black | Sachs Automatic
Manufacturer: Made in Germany · Material: Steel · Color: black · 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
EUR 25,80
Petrol filter large 6 / 8 mm orange
Material: Paper · Material: Plastic · Color: transparent · Color: white · Color: yellow · Ø inside: 4.2 mm · Ø outside: 38 mm · Total length: 49 mm · Total length: 108 mm · Filter type: Filter paper · demountable: No · Ø fuel hose connection: 6 mm · Ø fuel hose connection: 8 mm
EUR 5,75
NGK B7ES spark plug long thread
Manufacturer: NGK · Candle designation: B7ES · Candle thread type: long · Thread type: MF14x1.25 (fine pitch thread) · Width across flats: 21 mm · Spark plug socket: M4 · Spark plug socket: SAE · Suppressed: No · Area of application: Performance · Area of application: Racing · Area of application: Tuning
EUR 7,65
Not in stock
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
