Slot-controlled, fan-cooled 41 mm (55 ccm) tuning cylinder compatible with Swiss Sachs 50/2 and 502 engines, which were installed in Alpa, Caravelle, Comet, DKW, Eiger, Göricke, Hercules, Prior, Pony Junior, Rico, Rixe, and Walco mopeds.
Chrigi from Gfellers-Zweirad was personally involved in the development of the “Wummer” racing cylinder and tested it extensively. His feedback was directly incorporated into the design. The result is a cylinder that delivers impressive performance, especially in the mid-range. The focus here is not on peak power, but on smooth, strong power delivery.
The M40x1.5 mm exhaust thread allows for the installation of all standard exhaust systems. Thanks to the stock-style 37x37 mm bolt pattern for the cylinder head, all standard heads can also be mounted here.
The cylinder is camouflaged with the “30 km” lettering.
Notes:
The cylinder is shipped loose and without a piston, gasket set, studs, or other mounting parts.
The 60x40 mm bolt pattern for the cylinder studs is designed for Swiss engines and is therefore not suitable for German models.
For optimal power output and a precise fit, the cylinder should be used with a 17 mm swiing® tuning carburetor. This should be installed with a short air filter cap, a matching clamp (short), and the appropriate cover plate (long/deep).
You can find all the optional products listed here in the accessories section.
A good, affordable standard replacement part. GPO – GOOD PARTS ONLY.
| Manufacturer | GPO |
| Camouflaged | Yes |
| Material | Gray cast iron |
| Displacement | 55 ccm |
| Crankshaft stroke | 42 mm |
| Nominal diameter | 41 mm |
| Ø cylinder neck | 44.8 mm |
| Ø Outlet outside | 40 mm |
| Number of fixing points | 4 pcs |
| Hole spacing inlet | 32 mm |
| Outlet type | Union nut |
| Sachs | 502 (Saxonette) - AL , AML 50/2 - L CH (0.8 PS) , ML CH (0.8 PS) , MB (2.6 PS) , MLB (2.6 PS) |
Accessories & related products
GPO piston 40.96 mm | Sachs 502, 50/2, 50/3, 50/4
Nominal diameter: 41 mm · Manufacturer: GPO · Ø outside piston (A): 40.96 mm · Compression height (C): 28 mm · Curvature (D): 2.5 mm · Total piston height (E): 52 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Ø piston pin (B): 12 mm · Piston ring height: 1.5 mm · Weight piston kit: 90 g
EUR 40.90
Gasket cylinder base 0.5 mm | Sachs 50/2, 503
Material: Sealing carton · Thickness: 0.5 mm · Place of use: Cylinder base · Hole pattern [mm]: 60 x 40 · Area of application: Standard · Alternative version of the Pony OEM number: A1848 · Alternative version of the Sachs OEM number: 0250 113 100
EUR 4.70
swiing® revival carburetor 17 mm Bing SSB 1/17/69
Manufacturer: swiing® revival parts · Camouflaged: No · Component group Carburetor: Carburetor complete · Material: Aluminum · Carburetor type: SSB · Nominal diameter: 17 mm · Hole spacing inlet: 31 mm · Ø fuel hose connection: 6 mm · Mixed oil connection: No · Vacuum connection: No · Choke control: without choke · Nozzle size: 76 · Mounting type: Flange · Total length: 132 mm · Width: 85 mm · Height: 100 mm · Area of application: Standard · Area of application: Tuning
EUR 153.10
swiing® revival stud bolt set M5x26 inlet (10.9 strength) | Sachs 50/2, 502, 50/3
Width across flats: 8 mm · Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Thread type: M5x0.8 (standard thread) · Drive: External hexagon · Nominal diameter (thread): 5 mm · Thread length: 7 mm · Strength class: 8 · Strength class: 10.9 · Thread length: 14 mm · Total length: 26 mm
EUR 6.90
swiing® ingenious 41 mm cylinder head tuning | Sachs 50/2, 50/3, 50/4
Manufacturer: swiing® ingenious parts · Material: Aluminum · Surface: sandblasted · Ø outside: 98 mm · Ø cylinder: 41 mm · Number of fixing points: 4 pcs · Candle thread: long · Decompressor: M10x1.5 · Ø screw holder: 19 mm · Hole pattern [mm]: 37 x 37 · Total length: 127 mm · Width: 95 mm · Height: 50 mm · Area of application: Standard
EUR 82.60
NC-Motorparts 41 mm Cylinder Head Tuning | Sachs 50/3, 50/4 LKH
Manufacturer: NCMotorparts · Camouflaged: Yes · Material: Aluminum · Surface: sandblasted · Ø outside: 128 mm · Ø cylinder: 41 mm · Number of fixing points: 4 pcs · Candle thread: long · Decompressor: No · Hole pattern [mm]: 37 x 37 · Area of application: Tuning
EUR 116.90
BAD ASS cylinder head L Ø 41-43 mm | Sachs 502, 50/2, 50/3, 50/4
Manufacturer: BAD ASS · Material: Aluminum · Ø outside: 108 mm · Ø cylinder: 41 - 43 mm · Number of fixing points: 1 pcs · Number of fixing points: 4 pcs · Decompressor: M10x1.5 · Ø screw holder: 19.3 mm · Hole pattern [mm]: 37 x 37 · Area of application: Tuning
EUR 180.80
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swiing® revival exhaust nut M40x1.5 for 28 mm pipe, galvanized | Sachs
Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Nut type: Union nut · Ø outside: 46 mm · Thread type: MF40x1.5 (fine pitch thread) · Nominal diameter (thread): 40 mm · Ø inside: 29.2 mm · Height: 19 mm
EUR 16.80
GPO piston 40.96 mm | Sachs 502, 50/2, 50/3, 50/4
Nominal diameter: 41 mm · Manufacturer: GPO · Ø outside piston (A): 40.96 mm · Compression height (C): 28 mm · Curvature (D): 2.5 mm · Total piston height (E): 52 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Ø piston pin (B): 12 mm · Piston ring height: 1.5 mm · Weight piston kit: 90 g
EUR 40.90
swiing® revival sealing rubber fan cover black | Sachs 50/2, 50/3, 50/4 (A1938)
Total length: 7.9 mm · Manufacturer: swiing® revival parts · Material: Polyvinyl chloride (PVC-U_hard) · Color: black · Ø inside: 16.95 mm · Ø outside: 22.1 mm · Ø Bundle: 20.5 mm · Ø mounting hole: 17 mm · Waistband height: 2 mm · Material thickness: 7.8 mm · Pony OEM number: A1938 · Sachs OEM no.: 0260 044 000
EUR 7.10
Gasket cylinder base 0.5 mm | Sachs 50/2, 503
Material: Sealing carton · Thickness: 0.5 mm · Place of use: Cylinder base · Hole pattern [mm]: 60 x 40 · Area of application: Standard · Alternative version of the Pony OEM number: A1848 · Alternative version of the Sachs OEM number: 0250 113 100
EUR 4.70
swiing® revival carburetor 17 mm Bing SSB 1/17/69
Manufacturer: swiing® revival parts · Camouflaged: No · Component group Carburetor: Carburetor complete · Material: Aluminum · Carburetor type: SSB · Nominal diameter: 17 mm · Hole spacing inlet: 31 mm · Ø fuel hose connection: 6 mm · Mixed oil connection: No · Vacuum connection: No · Choke control: without choke · Nozzle size: 76 · Mounting type: Flange · Total length: 132 mm · Width: 85 mm · Height: 100 mm · Area of application: Standard · Area of application: Tuning
EUR 153.10
swiing® revival stud bolt set M5x26 inlet (10.9 strength) | Sachs 50/2, 502, 50/3
Width across flats: 8 mm · Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Thread type: M5x0.8 (standard thread) · Drive: External hexagon · Nominal diameter (thread): 5 mm · Thread length: 7 mm · Strength class: 8 · Strength class: 10.9 · Thread length: 14 mm · Total length: 26 mm
EUR 6.90
swiing® ingenious 41 mm cylinder head tuning | Sachs 50/2, 50/3, 50/4
Manufacturer: swiing® ingenious parts · Material: Aluminum · Surface: sandblasted · Ø outside: 98 mm · Ø cylinder: 41 mm · Number of fixing points: 4 pcs · Candle thread: long · Decompressor: M10x1.5 · Ø screw holder: 19 mm · Hole pattern [mm]: 37 x 37 · Total length: 127 mm · Width: 95 mm · Height: 50 mm · Area of application: Standard
EUR 82.60
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