
Slotted, blower-cooled 38 mm (50 cc) tuning cylinder, suitable for Swiss Sachs 50/2 (502) engines, which were installed on Alpa, Caravelle, Comet, DKW, Eiger, Göricke, Hercules, Prior, Pony Junior, Rico, Rixe or Walco mopeds / mopeds, among others.
Chrigi from Gfellers-Zweirad was personally involved in the development of the «Wummer» racing kit and tested the cylinder intensively. His feedback was directly integrated into the design. The result is a cylinder that impresses with its powerful performance, particularly in the mid rev range. The focus is not on top performance, but on smooth, high-torque power delivery.
Manufacturer: GPO · Material: Gray cast iron · Surface: raw · Displacement: 50 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 38 mm · Ø cylinder neck: 44.8 mm · Ø Outlet outside: 40 mm
Manufacturer: GPO · Nominal diameter: 38 mm · Ø outside piston (A): 37.94 mm · Ø piston pin (B): 12 mm · Compression height (C): 27.5 mm · Curvature (D): 3.5 mm · Total piston height (E): 53 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Flank safety device (FS) · Piston ring height: 1.7 mm · Thick piston ring: 2 mm · Alternative version of the Sachs OEM number: 0290 058 025 · Weight piston kit: 78 g
Hole pattern [mm]: 60 x 40 · Material: Sealing paper · Place of use: Cylinder base · Thickness: 0.25 mm · Area of application: Standard · Pony OEM number: A1848 · Sachs OEM no.: 0250 113 100
Place of use: Admission · Thickness: 2.6 mm · Hole spacing inlet: 30 mm
Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Thread type: M5x0.8 (standard thread) · Total length: 26 mm · Thread length: 14 mm, 7 mm · Width across flats: 8 mm · Strength class: 8, 10.9 · Drive: External hexagon
| Manufacturer | GPO |
| Material | Gray cast iron |
| Displacement | 50 ccm |
| Crankshaft stroke | 42 mm |
| Ø cylinder neck | 44.8 mm |
| Nominal diameter | 38 mm |
| Ø Outlet outside | 40 mm |
| Inlet window | 18 x 15 |
| Number of fixing points | 4 pcs |
| Ø outlet inside | 30 mm |
| Thread inlet | M5x0.8 (standard thread) |
| Hole pattern [mm] | 60 x 40 |
| Hole spacing inlet | 32 mm |
| Ø piston pin (B) | 12 mm |
| Decompressor | No |
| Outlet type | Union nut |
| Camouflaged | Yes |
| 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) |
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