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.
| Nominal diameter | 41 mm |
| Manufacturer | GPO |
| Material | Gray cast iron |
| Displacement | 55 ccm |
| Crankshaft stroke | 42 mm |
| Ø cylinder neck | 44.8 mm |
| Ø Outlet outside | 40 mm |
| Hole spacing inlet | 32 mm |
| Outlet type | Union nut |
| Camouflaged | Yes |
| Number of fixing points | 4 pcs |
| Supporter | Sigg |
| Durchführungsort | CH-8493 Saland |
| 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
swiing® revival carburetor 17 mm Bing SSB 1/17/69
Manufacturer: swiing® revival parts · Material: Aluminum · Component group Carburetor: Carburetor complete · Nominal diameter: 17 mm · Carburetor type: SSB · Mounting type: Flange · Nozzle size: 76 · Hole spacing inlet: 31 mm · Camouflaged: No · Ø fuel hose connection: 6 mm · Total length: 132 mm · Mixed oil connection: No · Width: 85 mm · Vacuum connection: No · Height: 100 mm · Choke control: without choke · Area of application: Standard · Area of application: Tuning
CHF 126.90
swiing® ingenious 41 mm cylinder head tuning | Sachs 50/2, 50/3, 50/4
Manufacturer: swiing® ingenious parts · Material: Aluminum · Surface: sandblasted · Ø cylinder: 41 mm · Ø outside: 98 mm · Height: 50 mm · Ø screw holder: 19 mm · Hole pattern [mm]: 37 x 37 · Candle thread: long · Decompressor: M10x1.5 · Total length: 127 mm · Width: 95 mm · Number of fixing points: 4 pcs · Area of application: Standard
CHF 68.50
NC-Motorparts 41 mm Cylinder Head Tuning | Sachs 50/3, 50/4 LKH
Manufacturer: NCMotorparts · Material: Aluminum · Surface: sandblasted · Ø cylinder: 41 mm · Ø outside: 128 mm · Candle thread: long · Decompressor: No · Hole pattern [mm]: 37 x 37 · Camouflaged: Yes · Number of fixing points: 4 pcs · Area of application: Tuning · Durchführungsort: CH-8493 Saland · Supporter: Sigg
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BAD ASS cylinder head L Ø 41-43 mm | Sachs 502, 50/2, 50/3, 50/4
Manufacturer: BAD ASS · Material: Aluminum · Ø cylinder: 41 - 43 mm · Ø outside: 108 mm · Decompressor: M10x1.5 · Hole pattern [mm]: 37 x 37 · Number of fixing points: 1 pcs · Number of fixing points: 4 pcs · Ø screw holder: 19.3 mm · Area of application: Tuning
CHF 149.90
GPO 38 mm "Wummer" Cylinder Kit (slot-controlled) | Sachs 502, 50/2 (CH)
Nominal diameter: 38 mm · Manufacturer: GPO · Material: Gray cast iron · Displacement: 50 ccm · Crankshaft stroke: 42 mm · Ø cylinder neck: 44.8 mm · Ø Outlet outside: 40 mm · Ø outlet inside: 30 mm · Inlet window: 18 x 15 mm · Thread inlet: M5x0.8 (standard thread) · Hole spacing inlet: 32 mm · Ø piston pin (B): 12 mm · Outlet type: Union nut · Number of fixing points: 4 pcs · Hole pattern [mm]: 60 x 40 · Decompressor: No · Camouflaged: Yes · Supporter: Sigg · Durchführungsort: CH-8493 Saland
CHF 149.90
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swiing® revival carburetor 17 mm Bing SSB 1/17/69
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swiing® ingenious 41 mm cylinder head tuning | Sachs 50/2, 50/3, 50/4
Manufacturer: swiing® ingenious parts · Material: Aluminum · Surface: sandblasted · Ø cylinder: 41 mm · Ø outside: 98 mm · Height: 50 mm · Ø screw holder: 19 mm · Hole pattern [mm]: 37 x 37 · Candle thread: long · Decompressor: M10x1.5 · Total length: 127 mm · Width: 95 mm · Number of fixing points: 4 pcs · Area of application: Standard
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GPO 41 mm "Wummer" Cylinder Kit (slot-controlled) | Sachs 502, 50/2 (CH)
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