Authentic 39 mm cylinder kit and accessories 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. The complete exhaust system, including mounting hardware, is also included. 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 numbers: 247-02.709 (cylinder), 247-02.112 (cylinder head)
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: GPO · Material: Steel · Surface: chrome-plated · Color: Chrome · Ø outside: 55 mm · Total length: 560 mm · Ø Flame tube outside: 28 mm · Ø Internal connection: 28 mm · Exhaust type: Cigar · Mounting type: Screwed clamp
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: chrome-plated · Color: Chrome · Ø inside: 25 mm · Ø outside: 28 mm · Total length: 360 mm · Mounting type: Stud bolts & nuts · Number of fixing points: 2 pcs · Hole spacing outlet: 40 mm
Manufacturer: GPO · Material: Steel · Surface: chrome-plated · Color: Chrome · Nominal diameter: 55 mm · Width: 18 mm · Number of fixing points: 1 pcs · Ø mounting hole: 8.2 mm
Material: Brass · Area of application: Standard · Nut type: Neck nut · Drive: External hexagon · Thread type: M6x1 (standard thread) · Ø outside: 9 mm · Height: 25 mm · Thread depth: 25 mm · Shank length: 20 mm · Width across flats: 10 mm · Nominal diameter (thread): 6 mm
Material: Steel · Surface: burnished · Thread type: M6x1 (standard thread) · Total length: 125 mm · Thread length: 21 mm, 17 mm
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
Manufacturer: swiing® ingenious parts · Material: Steel, FPM / FKM (colloquially known as Viton) · Surface: chrome-plated · Color: Chrome · Ø inside: 25 - 28 mm · Width: 40 mm · Mounting type: Nuts & bolts · Total length: 40 mm
| Manufacturer | swiing® ingenious parts, Vertex |
| Displacement | 50 ccm |
| Nominal diameter | 39 mm |
| Area of application | Standard |
| Crankshaft stroke | 42 mm |
| Ø piston pin (B) | 12 mm |
| Number of fixing points | 4 pcs |
| Thread inlet | M6x1 (standard thread) |
| Decompressor | No |
| Outlet type | slanted |
| 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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