44.0 mm replacement piston with two 1.5 mm rectangular piston rings with internal fuse (IS) for the 44 mm racing cylinder for your Tomos S25/2, A38B and A35 moped / moped.
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 | 44 mm |
| Manufacturer | GPO |
| Ø outside piston (A) | 43.96 mm |
| Compression height (C) | 21.9 mm |
| Curvature (D) | 4.15 mm |
| Total piston height (E) | 49.55 mm |
| Number of piston rings (F) | 2 pcs |
| Piston ring mold | Rectangular ring |
| Piston ring impact | Internal fuse (IS) |
| Piston ring height | 1.5 mm |
| Ø piston pin (B) | 12 mm |
| Tomos |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Manufacturer: GPO · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Number of components: 7 pcs · Material: Steel · Surface: burnished · Area of application: (Dis)assembly tool · Total length: 130 mm · Width across flats: 10 mm · Width across flats: 17 mm
EUR 24.40
GPO 44 mm cylinder kit tuning 12 mm KoBo | Tomos A35
Manufacturer: GPO · Camouflaged: No · Material: Aluminum · Surface: sandblasted · Area of application: Tuning · Displacement: 65 ccm · Crankshaft stroke: 43 mm · Ø cylinder neck: 47.8 mm · Nominal diameter: 44 mm · Ø outlet inside: 22.8 mm · Number of fixing points: 4 pcs · Inlet window: 35.5 x 29.5 mm · Thread inlet: M5x0.8 (standard thread) · Hole spacing inlet: 36 mm · Hole spacing inlet: 39 mm · Ø piston pin (B): 12 mm · Hole spacing outlet: 42 mm · Outlet type: slanted · Thread outlet: M6x1 (standard thread) · Hole pattern [mm]: 44 x 44 · Decompressor: No
EUR 110.20
Explore categories from Piston
Moped fans also bought
swiing® revival stud bolt inlet/outlet M6 x 30 (10.9 strength)
Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Diameter: 5.95 mm · Thread type: M6x1 (standard thread) · Nominal diameter (thread): 6 mm · Total length: 30 mm · Thread length: 12 mm · Strength class: 10.9
EUR 2.20
NTN 6203 C3 Ball bearing 17/40/12
Inner ring width: 12 mm · Manufacturer: NTN · Ball bearing closed: No · Bearing clearance: C3 · Bearing cage: Sheet steel cage ball-guided · Groove ring: No · Width: 12 mm · Material: Steel · Area of application: Standard · Stock number: 6203 · Bearing type: Deep groove ball bearing · Ø inside: 17 mm · Ø outside: 40 mm
EUR 10.90
Motorex engine oil (gear oil) manual 450 ml
Manufacturer: Motorex · Oil type: GL4 · Viscosity (SAE): 80W · Area of application: Gearbox lubrication with clutch · Contents: 450 ml · Gearbox type: Foot control · Gearbox type: Manual gearshift · Temperature resistance (min.): -30 - 220 °C
EUR 13.40
EUR 29.78/l
Airsal gasket set 44 - 45 mm | Puch
Manufacturer: Airsal · Area of application: Tuning · Material: Aluminum · Material: Sealing carton · Material: Sealing paper · Ø cylinder: 44 mm · Ø cylinder: 45 mm · Number of components: 4 pcs · Hole spacing inlet: 38 mm · Hole spacing outlet: 42 mm · Hole pattern [mm]: 44 x 44 mm · Decompressor: Yes
EUR 12.10
DMP 44 mm cylinder head (higher compression) | Tomos
Manufacturer: DMP · Material: Aluminum · Surface: glass bead blasted · Ø cylinder: 44 mm · Ø screw holder: 8 mm · Total length: 145 mm · Width: 145 mm · Hole pattern [mm]: 44 x 44 · Height: 66 mm · Candle thread: short · Number of fixing points: 4 pcs · Area of application: Racing · Area of application: Tuning
EUR 73.40
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
