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.
| Nominal diameter | 45 mm |
| Manufacturer | Athena |
| Material | Aluminum |
| Surface | sandblasted |
| Crankshaft stroke | 44 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 |
| Inlet window | 23.4 x 12.6 mm |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing inlet | 31.5 mm |
| Ø piston pin (B) | 12 mm |
| Outlet type | straight, clamped |
| Hole spacing outlet | 50 mm |
| Number of fixing points | 4 pcs |
| Thread outlet | M8x1.25 (standard thread) |
| Hole pattern [mm] | 56 (61) x 56 |
| Decompressor | M10x1.5 |
| Camouflaged | No |
| Area of application | Tuning |
| Sachs | 505 (with pedal shaft) - 1A (AT) , 2A (HG) , 2B (HG) 508 - 1 A 535 |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima |
Accessories & related products
NGK B8ES spark plug long thread
Manufacturer: NGK · Candle designation: B8ES · Candle thread type: long · Thread type: MF14x1.25 (fine pitch thread) · Spark plug socket: M4 · Spark plug socket: SAE · Suppressed: No · Area of application: Performance · Area of application: Racing · Area of application: Tuning · Width across flats: 21 mm
EUR 7.95
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
EUR 85.70
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 · Thread type: MF14x1.25 (fine pitch thread) · Electrode material: Iridium · Suppressed: Yes · Width across flats: 21 mm · Area of application: High End · Area of application: MX · Area of application: Racing · Area of application: Tuning
EUR 33.00
swiing® ingenious exhaust adapter 24 mm Athena cylinder | Sachs 504, 505, 508
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: galvanized (blue) · Total length: 67 mm · Width: 43 mm · Height: 25.5 mm · Ø inside: 20 mm · Ø mounting hole: 8.3 mm · Ø outside: 24 mm · Hole spacing: 50 mm
EUR 30.50
Explore categories from Cylinder
Moped fans also bought
- 10 %
Hot 
BERU spark plug connector 1 kΩ interference suppressed
Manufacturer: BERU · Material: Sheet metal (steel) · Color: silver · Ø cable: 5 mm · Ø cable: 7 mm · Spark plug socket: M4 · Cable available: No · Resistance: 1000 Ω · Subcategory: Spark plug connector · Suppressed: Yes · Pony OEM number: A2099 · Sachs OEM no.: 0265 100 00
EUR 10.80
EUR 9.70
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 · Area of application: Gearbox lubrication with clutch · Gearbox type: Manual gearshift
EUR 13.40
EUR 29.78/l
NGK B8ES spark plug long thread
Manufacturer: NGK · Candle designation: B8ES · Candle thread type: long · Thread type: MF14x1.25 (fine pitch thread) · Spark plug socket: M4 · Spark plug socket: SAE · Suppressed: No · Area of application: Performance · Area of application: Racing · Area of application: Tuning · Width across flats: 21 mm
EUR 7.95
Oil seal NBR 15/30/5.5 A crankshaft | Sachs (A4215 & A5602)
Place of use: Crankshaft · Shaft seal type: A - With rubberized outer part / one sealing lip. · Width: 5.5 mm · Manufacturer: Sachs · Material: NBR · Ø inside: 15 mm · Ø outside: 30 mm · Temperature resistance (min.): -30 - 100 °C · Pony OEM number: A5602 · Sachs OEM no.: 0230 111 100
EUR 9.70
Oil seal NBR 15/35/7 AS crankshaft | Sachs 504, 535 (A4214)
Shaft seal type: AS - With rubberized outer casing / one sealing lip / one dust lip. · Manufacturer: Sachs · Material: NBR · Ø inside: 15 mm · Place of use: Crankshaft · Temperature resistance (min.): -30 - 100 °C · Ø outside: 35 mm · Width: 7 mm
EUR 10.90
NTN 6202 Ball bearing 15/35/11
Bearing type: Deep groove ball bearing · Inner ring width: 11 mm · Manufacturer: NTN · Ball bearing closed: No · Bearing clearance: CM (special/noise-reduced) · Bearing cage: Sheet steel cage ball-guided · Groove ring: No · Material: Steel · Width: 11 mm · Stock number: 6202 · Ø inside: 15 mm · Ø outside: 35 mm
EUR 8.45
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
