Montageanleitung 
Authentic 39 mm cylinder (including head) compatible with your Zündapp Belmondo moped / moped with chassis number 71 and engine type 247, as well as the Zündapp M25 and M50 Bergsteiger mopeds with chassis number 434 and engine type 247.
In addition to these models, the cylinder also fits ALPA Spezial 3000 or ALPA Black River small motorcycles equipped with a Zündapp Type 247 engine.
This high-quality cylinder kit—including a cylinder head from the premium swiing® ingenious brand—paired with the legendary Vertex piston in OEM quality, delivers 1.6 PS to the rear wheel when properly tuned.
The Nikasil coating ensures optimal lubrication and durability, while the split transfer ports optimize fuel-air mixture flow.
In addition to the cylinder, cylinder head, and piston, the package also includes all gaskets, studs, and silent blocks. All instructions for installing and breaking in the cylinder are explained in the video.
Please select the desired cylinder head—with or without a decompression hole—from the drop-down menu.
Notes:
For Zündapp engines with an 85 mm short connecting rod, you must first convert to a long connecting rod with a length of 91 mm (center-to-center) before using the cylinder.
Please observe the installation direction during assembly.
The piston is installed with the arrow pointing toward the exhaust on the exhaust side.
A sophisticated product meeting the highest standards of the swiing® quality brand.
Original Zündapp part number: 247-02.709, 247-02.112
Hole pattern [mm]: 44 x 42 · Manufacturer: swiing® ingenious parts · Material: Aluminum · Surface: sandblasted · Displacement: 50 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 39 mm · Ø cylinder neck: 48 mm · Ø Inlet inside: 9.2 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 40 mm · Ø piston pin (B): 18.5 mm · Outlet type: slanted · Hole spacing outlet: 40 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Decompressor: No · Camouflaged: No
Manufacturer: swiing® revival parts · Material: Rubber, Steel · Ø inside: 8.2 mm · Ø outside: 19 mm · Ø Bundle: 25.5 mm · Total length: 21 mm
Material: Steel · Surface: blackened · Thread type: M6x1 (standard thread) · Total length: 145 mm · Thread length: 25.3 mm · Diameter: 5.2 mm · Nominal diameter (thread): 6 mm
| Material | Aluminum |
| Surface | sandblasted |
| Manufacturer | swiing® ingenious parts |
| Displacement | 50 ccm |
| Nominal diameter | 39 mm |
| Crankshaft stroke | 42 mm |
| Ø piston pin (B) | 18.5 mm |
| Ø cylinder neck | 48 mm |
| Ø Inlet inside | 9.2 mm |
| Number of fixing points | 4 pcs |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing inlet | 40 mm |
| Outlet type | slanted |
| Hole pattern [mm] | 44 x 42 |
| Hole spacing outlet | 40 mm |
| Thread outlet | M6x1 (standard thread) |
| Camouflaged | No |
| Zündapp OEM number | 247-02.709, 247-02.112 |
| Zündapp | Belmondo (Type 247-71) |
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swiing® ingenious piston 39 mm Vertex | Zündapp Belmondo, Bergsteiger
Manufacturer: swiing® ingenious parts · Nominal diameter: 39 mm · Ø outside piston (A): 38.95 mm · Ø piston pin (B): 12 mm · Compression height (C): 26.3 mm · Curvature (D): 1.5 mm · Total piston height (E): 51.5 mm · Number of piston rings (F): 1 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Oblique push · Piston ring height: 1.5 mm · Weight piston kit: 82 g
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Thickness: 10 mm · Manufacturer: swiing® revival parts · Area of application: Standard · Material: Steel · Area of application: Tuning · Surface: copper-coated · Ø piston pin (B): 12 mm · Connecting rod length center-center: 91 mm · Ø Connecting rod bolt: 16 mm · Ø lower connecting rod eye outside: 27 mm · Ø upper connecting rod eye outside: 23 mm · Ø lower bearing inside: 21 mm · Ø inside upper bearing: 15 mm · Total length: 115 mm · Dimension lower bearing: 16/21 x 9.7 mm · Dimension upper bearing: 12/15 x 14.2 mm · Connecting rod pin length: 33.8 mm
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