38 mm replacement piston / piston kit with two pieces of 2 mm rectangular piston rings with flank lock (FS) suitable for the windage-calibrated cylinder of Sachs 50/3 & 50/4 mopeds / mopeds with square intake.
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 images.
The piston kit contains piston pins, piston clips and piston rings.
Corresponding assembly tools, piston rings, piston pin retainers etc. can be found under accessories.
Original Sachs spare part number: 0290 058 025
| Ø outside piston (A) | 37.94 mm |
| Compression height (C) | 28 mm |
| Curvature (D) | 2.95 mm |
| Nominal diameter | 38 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) |
| Piston ring height | 2 mm |
| Ø piston pin (B) | 12 mm |
| Weight piston kit | 73 g |
| Sachs | 50/3 50/4 - MLFB (2.6 PS) , LKH (4.5 PS) |
Ratings
Accessories & related products
38 mm cylinder kit square inlet | Sachs 50/3, 50/4
Material: Gray cast iron · Surface: sandblasted · Displacement: 50 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 38 mm · Hole spacing inlet: 31 mm · Camouflaged: No · Thread inlet: M5x0.8 (standard thread) · Hole pattern [mm]: 51 x 40 · Outlet type: Union nut · Ø piston pin (B): 12 mm · Area of application: Tuning · Thread outlet: M35x2 (standard thread) · Number of fixing points: 4 pcs
152,90 EUR
GPO piston pin extractor Ø 10, 12, 14 mm
Total length: 130 mm · Manufacturer: GPO · Material: Steel · Surface: burnished · Number of components: 7 pcs · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Area of application: (Dis)assembly tool · Width across flats: 10 mm · Width across flats: 17 mm
23,40 EUR
Explore categories from Piston
Moped fans also bought
Magura cable clamp Ø 8 x 15 mm
Total length: 15 mm · Manufacturer: Magura · Area of application: Standard · Material: Brass · Material: Steel · Surface: galvanized (blue) · Surface: nickel-plated · Drive: External hexagon · Drive: Slot · Ø Cable bushing: 2.3 mm · Screw head: Hexagon · Ø outside: 8 mm · Ø Bundle: 6 mm · Thread type: M6x1 (standard thread) · Thread length: 7 mm · Width across flats: 7 mm
2,95 EUR
OMG fuel filter metal 6 mm (removable)
Ø inside: 3.45 mm · Ø outside: 22 mm · Total length: 40 mm · Total length: 63 mm · Manufacturer: OMG · Material: Glass · Material: Metal · Color: gray · Color: transparent · Color: white · Filter type: Plastic net · demountable: Yes · Ø fuel hose connection: 5.6 mm · Ø fuel hose connection: 6 mm
8,00 EUR
swiing® revival seal Float SRE, SRC, SRF, SRA
Ø inside: 41 mm · Ø outside: 45 mm · Manufacturer: swiing® revival parts · Material: Sealing paper · Component group Carburetor: Sealing, revising · Surface: blank · Carburetor type: SRA (1/11/31) Velux · Carburetor type: SRA (1/11/35) Velux · Carburetor type: SRC · Carburetor type: SRE · Carburetor type: SRF · Thickness: 1.5 mm · Pony OEM number: A4519 · Sachs OEM no.: 0950 128 000
3,30 EUR
Magura gas cable clamp / deco cable clamp Ø 5 x 6 mm
Manufacturer: Magura · Material: Brass · Material: Steel · Surface: nickel-plated · Number of components: 2 pcs · Thread type: M4x0.7 (standard thread) · Ø outside: 5 mm · Ø Cable bushing: 1.6 mm · Screw head: Lens head · Total length: 6 mm · Thread length: 4 mm · Drive: Slot
2,35 EUR
GPO ignition plate 90 mm Bosch / DUCATI
Manufacturer: GPO · Material: Aluminum · Tension: 6 V · Cable length: 400 mm · Cable length: 500 mm · Ø outside: 90 mm · Ø inside: 18.5 mm · Ø bolt circle: 80 mm · Number of cables: 3 pcs · Number of fixing points: 4 pcs · Area of application: Original · Area of application: Standard
88,10 EUR
Magura adjusting screw brake short
Manufacturer: Magura · Material: Brass · Surface: nickel-plated · Color: silver · Thread type: MF6x0.75 (fine pitch thread) · Ø shaft: 6.1 mm · Total length: 31 mm · Total length: 40 mm · Thread length: 15 mm · Ø External head: 9.15 mm · Drive: Knurled screw · Shank length: 6.9 mm
4,00 EUR
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
