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For: Sachs

33439

GPO 41 mm “Wummer” Cylinder (slot-controlled) | Sachs 502, 50/2 (CH)

EUR 161.40

Incl. 22% VAT.

Description

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.

ManufacturerGPO
MaterialGray cast iron
Displacement55 ccm
Crankshaft stroke42 mm
Nominal diameter41 mm
Ø cylinder neck44.8 mm
Hole spacing inlet32 mm
Ø Outlet outside40 mm
CamouflagedYes
Number of fixing points4 pcs
Outlet typeUnion 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)

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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 · 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

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