39 mm tuning kit with 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.
With the proper tuning, you’ll deliver a powerful 2.8 PS to the rear wheel.
All instructions for installing and breaking in the cylinder are explained in the video.
In addition to the complete racing kit—including the cylinder head—the package also includes the exhaust system with mounting hardware, as well as the carburetor, air filter, and reinforced clutch springs. 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 bore—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.
Hole pattern [mm]: 44 x 44 · Inlet window: 20.7 x 13 mm · 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 outlet inside: 18.6 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 40 mm · Ø piston pin (B): 12 mm · Outlet type: slanted · Hole spacing outlet: 40 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Decompressor: No · Camouflaged: No · Area of application: Tuning
Manufacturer: swiing® ingenious parts · Material: Steel · Surface: chrome-plated · Color: Chrome · Ø outside: 70 mm · Total length: 730 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: Made in Portugal · Material: Steel · Surface: chrome-plated · Color: Chrome · Nominal diameter: 70 mm · Clamping diameter: 67 - 71 mm · Width: 28 mm · Thickness: 2 mm · Number of fixing points: 1 pcs · Ø mounting hole: 8.2 mm
Manufacturer: swiing® ingenious parts · Camouflaged: No · Material: Aluminum · Ø inside: 16 mm · Ø External connection: 23 mm · Mounting type: Screws · Hole spacing inlet: 40 mm · Number of fixing points: 2 pcs · Total height: 42 mm · Height flange center hole: 35 mm · Total length: 35 mm · Area of application: Tuning
Nozzle block: 2.xx · Material: Aluminum · Carburetor type: SRF · Nominal diameter: 17 mm · Ø Internal connection: 23 mm · Ø Air filter connection: 60 mm, 64 mm · Ø fuel hose connection: 6 mm · Mixed oil connection: No · Vacuum connection: No · Choke control: Hand choke · Nozzle thread: M4x0.7 (standard thread) · Mounting type: Plug connection clamped · Clamping screw torque (max.): 3 N/m, 4 N/m · Total length: 78 mm · Width: 64 mm · Height: 117 mm · Area of application: Tuning · Component group Carburetor: Carburetor complete
Manufacturer: swiing® ingenious parts · Camouflaged: No · Color: black, red · Filter type: Foam · Total length: 80 mm · Ø Internal connection: 65 mm · Ø outside: 75 mm · Mounting type: Plug connection clamped · Area of application: Tuning
Nozzle size: 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90 · Manufacturer: swiing® revival parts · Material: Brass · Quantity: 11 pcs · Carburetor type: 18 Catalyst, 85, 17 Catalyst · Nozzle type: Main nozzle · Nozzle thread: M4x0.7 (standard thread) · Drive: Slot · Component group Carburetor: Spraying
Manufacturer: swiing® ingenious parts · Number of springs: 10 pcs · Area of application: Tuning · Alternative version of the Zündapp OEM number: 247-06.107, 281-06.101
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 |
| Camouflaged | No |
| Displacement | 50 ccm |
| Crankshaft stroke | 42 mm |
| Ø piston pin (B) | 12 mm |
| Nominal diameter | 39 mm |
| Area of application | Tuning |
| Thread inlet | M6x1 (standard thread) |
| Decompressor | No |
| Outlet type | slanted |
| Thread outlet | M6x1 (standard thread) |
| Zündapp | Belmondo (Type 247-71) Moped 25 (M 25) / Moped M 50 Bergsteiger (Type 247-434) |
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