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 dimensions 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 |
| Ø outside piston (A) | 38.955 mm |
| Compression height (C) | 26.3 mm |
| Curvature (D) | 1.3 mm |
| Total piston height (E) | 51.65 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 | C |
| Weight piston kit | 84 g |
| 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 · Area of application: (Dis)assembly tool · Material: Steel · Surface: burnished · Number of components: 7 pcs · Total length: 130 mm · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Width across flats: 10 mm · Width across flats: 17 mm
CHF 19.90
Meteor piston pin Ø 12 mm (length: 31 - 40 mm)
Surface: Hardened · Manufacturer: Meteor · Material: Steel · Total length: 31 mm · Total length: 31.5 mm · Total length: 33 mm · Total length: 35.5 mm · Total length: 37 mm · Total length: 38 mm · Total length: 40 mm · Ø piston pin (B): 12 mm · Pony OEM number: A1112 · Sachs OEM no.: 0216 003 105
CHF 6.90
Explore categories from Piston
Moped fans also bought
swiing® revival needle roller bearing 12/15/14.2 original
Bearing type: Needle sleeve · Dimension needle bearing: 12/15 x 14.2 · Ø outside: 15 mm · Manufacturer: swiing® revival parts · Bearing cage: Sheet steel cage · Width: 14.2 mm · Ø inside: 12 mm · Alternative version of the Pony OEM number: A4222 · Tomos OEM number: 035548 · Alternative version of the Sachs OEM number: 0232 155 001
CHF 8.90
17 mm Bing SRF carburetor (replica)
Material: Aluminum · Component group Carburetor: Carburetor complete · Width: 64 mm · Carburetor type: SRF · Height: 117 mm · Nominal diameter: 17 mm · Total length: 78 mm · Ø fuel hose connection: 6 mm · Ø Internal connection: 23 mm · Ø Air filter connection: 60 mm · Ø Air filter connection: 64 mm · Mixed oil connection: No · Mounting type: Plug connection clamped · Vacuum connection: No · Choke control: Hand choke · Nozzle thread: M4x0.7 (standard thread) · Nozzle block: 2.xx · Area of application: Tuning · Clamping screw torque (max.): 3 N/m · Clamping screw torque (max.): 4 N/m
CHF 64.90
Bumm Round Mirror, Black/Chrome
Mirror property: downsizing · Manufacturer: Bumm · Thread type: M8x1.25 (standard thread) · Material: Glass · Material: Plastic · Material: Steel · Test mark: none · Surface: chrome-plated · Surface: raw · Color: Chrome · Color: black · Clamping diameter: 22 mm · Ø mirror surface: 102 mm · Ø mirror rod: 8 mm · Mirror rod length: 190 mm · Total length: 300 mm · Thread size: M8
CHF 19.90
Working late? Evening hours on Thursday until 20:00
