38.0 mm piston with two 2 mm rectangular piston rings with flank lock (FS) for mopeds, mopeds and small motorcycles with Sachs 502/1 A, 502/1 B, 502/1 AX, 502/1 AX, 502/1 A CH, 502/1 A DK, 502/1 A NL, 502/1 A S and 502/1 A SF engine (colloquially often called torpedo or rocket engine).
The piston set fits the following models, among others:
- Hercules CB1 City Bike, L50, MF1, MF2, MP1
- Rex Miniped, Miniped MK2
- Sparta Happy
- Motograziella
- Pony City
- KTM Hobby 1968 - 1972
The piston pin is closed on one side, as on the original, so that no exhaust gases are forced back through the pin into the intake tract.
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 | 38 mm |
| Thick piston ring | 1.6 mm |
| Ø outside piston (A) | 37.94 mm |
| Compression height (C) | 28 mm |
| Curvature (D) | 3 mm |
| Total piston height (E) | 53 mm |
| Number of piston rings (F) | 2 pcs |
| Piston ring mold | Rectangular ring |
| Ø piston pin (B) | 12 mm |
| Piston ring impact | Flank safety device (FS) |
| Piston ring height | 2 mm |
| Piston weight | 87 g |
| Sachs | 502 1A / 1B (torpedo) |
| Hercules | |
| KTM | |
| Motograziella |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Material: Steel · Surface: burnished · Total length: 130 mm · Manufacturer: GPO · Number of components: 7 pcs · Area of application: (Dis)assembly tool · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Width across flats SW: 10 mm · Width across flats SW: 17 mm
EUR 23.70
Cylinder base and intake gasket | Sachs 502/1B
Material: Oiled paper · Thickness: 0.35 mm · Thickness: 0.55 mm · Manufacturer: Made in Germany · Number of components: 2 pcs · Hole spacing inlet: 30 mm · Hole pattern [mm]: 40 x 41 mm · Sachs OEM no.: 0250 139 000 · Sachs OEM no.: 0250 140 000
EUR 11.70
Not in stock
Piston 38 mm | Sachs 50/2 1A, 1B
Nominal diameter: 38 mm · Thick piston ring: 1.6 mm · Ø outside piston (A): 37.94 mm · Compression height (C): 28 mm · Curvature (D): 3 mm · Total piston height (E): 53 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Flank safety device (FS) · Ø piston pin (B): 12 mm · Piston ring height: 2 mm · Piston weight: 87 g
EUR 71.40
Piston 38.6 mm | Sachs 50/2 1A, 1B
Nominal diameter: 38.6 mm · Thick piston ring: 1.6 mm · Ø outside piston (A): 38.54 mm · Compression height (C): 28 mm · Curvature (D): 3 mm · Total piston height (E): 53 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Flank safety device (FS) · Ø piston pin (B): 12 mm · Piston ring height: 2 mm · Piston weight: 92 g
EUR 71.40
Carburetor Bing 1/10/99 (replica) | Sachs 50/2 1A, 1B
Nominal diameter: 10 mm · Total length: 65 mm · Material: Aluminum · Component group Carburetor: Carburetor complete · Choke control: Hand choke · Nozzle thread: M3.5x0.6 (standard thread) · Ø fuel hose connection: 6 mm · Nozzle size: 56 · Ø Internal connection: 16 mm · Ø Air filter connection: 54.5 mm · Nozzle block: 2.15
EUR 101.20
Moped fans also bought
Magura cable clamp Ø 8 x 15 mm
Drive: External hexagon · Drive: Slot · Manufacturer: Magura · Total length: 15 mm · Material: Brass · Material: Steel · Surface: galvanized (blue) · Surface: nickel-plated · Ø Cable bushing: 2.3 mm · Ø Bundle: 6 mm · Ø outside: 8 mm · Screw head: Hexagon · Thread type: M6x1 (standard thread) · Area of application: Standard · Width across flats SW: 7 mm · Thread length: 7 mm
EUR 3.00
Magura adjusting screw brake short
Drive: Knurled screw · Manufacturer: Magura · Total length: 31 mm · Total length: 40 mm · Material: Brass · Surface: nickel-plated · Color: silver · Ø External head: 9.15 mm · Thread type: MF6x0.75 (fine pitch thread) · Ø shaft: 6.1 mm · Shank length: 6.9 mm · Thread length: 15 mm
EUR 4.05
Decompressor cable Ø 1.5 mm x 180 cm (pear-shaped nipple)
Ø nipple: 3.3 mm · Ø nipple: 5 mm · Manufacturer: Made in Germany · Material: Steel · Surface: galvanized (blue) · Ø Stranded wire: 1.5 mm · Nipple shape: Pears · Area of application: Standard · Cable length: 1800 mm · Nipple length: 7 mm · Pony OEM number: P0919
EUR 2.85
Alligator end piece for indoor cable, aluminum (per piece)
Manufacturer: Alligator · Total length: 12 mm · Material: Aluminum · Surface: raw · Number of connections: 1 pcs · Color: silver · Number of components: 1 pcs · Ø inside: 2.2 mm · Ø outside: 3.1 - 4 mm · Area of application: Standard
EUR 0.50
Fuel tap vertical M16x1 (with union nut) outgoing at the bottom
Manufacturer: GPO · Mounting type: Union nut · Possible lever positions: open / closed / reserve · Material lever: Metal · Filter type: Plastic net · Ø fuel hose connection: 6 mm · Installation direction: vertical / vertical · Outlet direction: below · Thread type: MF16x1 (fine pitch thread) · Spare tube shape: straight · Reserve level: 90 mm
EUR 23.70
Cylinder base and intake gasket | Sachs 502/1B
Material: Oiled paper · Thickness: 0.35 mm · Thickness: 0.55 mm · Manufacturer: Made in Germany · Number of components: 2 pcs · Hole spacing inlet: 30 mm · Hole pattern [mm]: 40 x 41 mm · Sachs OEM no.: 0250 139 000 · Sachs OEM no.: 0250 140 000
EUR 11.70
Not in stock
Collection only possible with online purchase and appointment.
