38 mm replacement piston / piston kit with two pieces of 2 mm rectangular piston rings with flank lock (FS) suitable for the windage-cooled 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 pictures.
| Nominal diameter | 38 mm |
| Ø outside piston (A) | 37.94 mm |
| Compression height (C) | 28 mm |
| Curvature (D) | 2.95 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 |
| 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 · Area of application: Tuning · Displacement: 50 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 38 mm · Hole spacing inlet: 31 mm · Number of fixing points: 4 pcs · Thread inlet: M5x0.8 (standard thread) · Hole pattern [mm]: 51 x 40 · Ø piston pin (B): 12 mm · Outlet type: Union nut · Thread outlet: M35x2 (standard thread) · Camouflaged: No
EUR 159.90
GPO piston pin extractor Ø 10, 12, 14 mm
Manufacturer: GPO · Material: Steel · Surface: burnished · Area of application: (Dis)assembly tool · Width across flats: 10 mm · Width across flats: 17 mm · Total length: 130 mm · Number of components: 7 pcs · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm
EUR 24.50
Explore categories from Piston
Moped fans also bought
Magura cable clamp Ø 8 x 15 mm
Material: Brass · Manufacturer: Magura · Material: Steel · Surface: galvanized (blue) · Surface: nickel-plated · Total length: 15 mm · Ø Cable bushing: 2.3 mm · Screw head: Hexagon · Ø Bundle: 6 mm · Drive: External hexagon · Drive: Slot · Thread length: 7 mm · Ø outside: 8 mm · Thread type: M6x1 (standard thread) · Width across flats: 7 mm · Area of application: Standard
EUR 3.05
OMG fuel filter metal 6 mm (removable)
Manufacturer: OMG · Material: Glass · Material: Metal · Color: gray · Color: transparent · Color: white · Filter type: Plastic net · demountable: Yes · Total length: 40 mm · Total length: 63 mm · Ø inside: 3.45 mm · Ø fuel hose connection: 5.6 mm · Ø fuel hose connection: 6 mm · Ø outside: 22 mm
EUR 8.35
swiing® revival seal Float SRE, SRC, SRF, SRA
Material: Sealing paper · Manufacturer: swiing® revival parts · Component group Carburetor: Sealing, revising · 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 · Ø inside: 41 mm · Ø outside: 45 mm · Pony OEM number: A4519 · Sachs OEM no.: 0950 128 000
EUR 3.45
Magura gas cable clamp / deco cable clamp Ø 5 x 6 mm
Material: Brass · Manufacturer: Magura · Material: Steel · Surface: nickel-plated · Number of components: 2 pcs · Total length: 6 mm · Ø Cable bushing: 1.6 mm · Screw head: Lens head · Drive: Slot · Thread length: 4 mm · Ø outside: 5 mm · Thread type: M4x0.7 (standard thread)
EUR 2.45
Hot 
GPO ignition plate 90 mm Bosch / DUCATI
Material: Aluminum · Manufacturer: GPO · Tension: 6 V · Cable length: 400 mm · Cable length: 500 mm · Number of cables: 3 pcs · Number of fixing points: 4 pcs · Ø inside: 18.5 mm · Ø outside: 90 mm · Ø bolt circle: 80 mm · Area of application: Original · Area of application: Standard
EUR 92.20
Magura adjusting screw brake short
Manufacturer: Magura · Material: Brass · Surface: nickel-plated · Color: silver · Ø shaft: 6.1 mm · Shank length: 6.9 mm · Thread length: 15 mm · Total length: 31 mm · Total length: 40 mm · Drive: Knurled screw · Ø External head: 9.15 mm · Thread type: MF6x0.75 (fine pitch thread)
EUR 4.20
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
