
39.0 mm piston with a rectangular piston ring with internal fuse (IS), suitable for Zündapp Belmondo mopeds, Zündapp Bergsteiger M25/M50 mopeds, as well as Alpa Spezial 3000 or Alpa Black River small motorcycles, which have a Zündapp type 247 engine installed.
The detailed dimensioning of the piston according to the technical drawing can be found in the details. You can also find out about the relevant piston rings, their stems and locking types on the legend in the pictures.
| Nominal diameter | 39 mm |
| Manufacturer | Meteor |
| Ø outside piston (A) | 38.96 mm |
| Compression height (C) | 26.2 mm |
| Curvature (D) | 1.3 mm |
| Total piston height (E) | 51.5 mm |
| Number of piston rings (F) | 1 pcs |
| Piston ring mold | Rectangular ring |
| Piston ring impact | Internal fuse (IS) |
| Ø piston pin (B) | 12 mm |
| Tolerance group | CD |
| Weight piston kit | 85 g |
| Zündapp OEM number | 248-02.703 |
| Zündapp | Belmondo (Type 247-71) Moped 25 (M 25) / Moped M 50 Bergsteiger (Type 247-434) |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Manufacturer: GPO · Material: Steel · Surface: burnished · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Total length: 130 mm · Area of application: (Dis)assembly tool · Number of components: 7 pcs · Width across flats: 10 mm · Width across flats: 17 mm
23,40 EUR
Explore categories from Piston
Moped fans also bought
Motorex engine oil (gear oil) manual 450 ml
Manufacturer: Motorex · Viscosity (SAE): 80W · Area of application: Gearbox lubrication with clutch · Oil type: GL4 · Contents: 450 ml · Gearbox type: Foot control · Gearbox type: Manual gearshift · Temperature resistance (min.): -30 - 220 °C
12,80 EUR
28,44 EUR/l
Karcoma fuel tap M16x1 vertical (with union nut) plastic connection | Puch X30 Velux
Manufacturer: Karcoma · Possible lever positions: open / closed / reserve · Material lever: Metal · Filter type: Plastic net · Installation direction: vertical / vertical · Outlet direction: any · Thread type: MF16x1 (fine pitch thread) · Spare tube shape: straight · Mounting type: Union nut · Ø fuel hose connection: 6 mm · Reserve level: 50 mm
35,20 EUR
swiing® ingenious needle roller bearing 12/15/14.2 original silver cage
Manufacturer: swiing® ingenious parts · Bearing type: Needle roller and cage assembly · Bearing cage: Silver cage · Ø outside: 15 mm · Ø inside: 12 mm · Width: 14.2 mm · Dimension needle bearing: 12/15 x 14.2 · Alternative version of the Pony OEM number: A4222 · Tomos OEM number: 035548 · Alternative version of the Sachs OEM number: 0232 157 001
14,00 EUR






