44 mm replacement piston with two 1.5 mm rectangular piston rings with internal fuse (IS) suitable for Tomos S25/2, A38B and A35 mopeds / mopeds.
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.
You will find the corresponding assembly tool, piston pin locks and, if necessary, the corresponding cylinder in the accessories section.
Quality product from the Spanish manufacturer Airsal.
| Manufacturer | Airsal |
| Ø outside piston (A) | 43.95 mm |
| Compression height (C) | 22 mm |
| Curvature (D) | 3.5 mm |
| Total piston height (E) | 49 mm |
| Number of piston rings (F) | 2 pcs |
| Nominal diameter | 44 mm |
| Piston ring mold | Rectangular ring |
| Piston ring impact | Internal fuse (IS) |
| Piston ring height | 1.5 mm |
| Ø piston pin (B) | 12 mm |
| Weight piston kit | 84 g |
| Tomos |
Ratings
Accessories & related products
Airsal 44 mm cylinder kit tuning 12 mm KoBo | Tomos A35
Manufacturer: Airsal · Material: Aluminum · Surface: sandblasted · Displacement: 65 ccm · Nominal diameter: 44 mm · Hole spacing inlet: 31.5 mm · Hole spacing inlet: 36 mm · Hole spacing inlet: 39 mm · Ø cylinder neck: 47.4 mm · Camouflaged: No · Ø outlet inside: 22 mm · Inlet window: 29.5 x 37.5 · Hole spacing outlet: 42 mm · Thread inlet: M5x0.8 (standard thread) · Hole pattern [mm]: 44 x 44 · Decompressor: No · Outlet type: straight · Ø piston pin (B): 12 mm · Area of application: Tuning · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs
EUR 144.60
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
EUR 24.00
GPO 44 mm cylinder kit tuning 12 mm KoBo | Tomos A35
Manufacturer: GPO · Material: Aluminum · Area of application: Tuning · Surface: sandblasted · Displacement: 65 ccm · Crankshaft stroke: 43 mm · Nominal diameter: 44 mm · Ø cylinder neck: 47.8 mm · Camouflaged: No · Ø outlet inside: 22.8 mm · Inlet window: 35.5 x 29.5 · Hole spacing inlet: 36 mm · Hole spacing inlet: 39 mm · Thread inlet: M5x0.8 (standard thread) · Hole spacing outlet: 42 mm · Decompressor: No · Outlet type: slanted · Ø piston pin (B): 12 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Hole pattern [mm]: 44 x 44
EUR 108.40
EUR 96.40
Explore categories from Piston
Moped fans also bought
GPO gasket set 45 mm cylinder & diaphragm | Tomos A3, A35
Manufacturer: GPO · Material: Aluminum · Material: Composite materials · Material: Oiled paper · Number of components: 5 pcs · Ø cylinder: 45 mm · Hole spacing outlet: 42 mm · Hole pattern [mm]: 44 x 44 mm / 39 x 36/32 mm · Decompressor: Yes · Area of application: Tuning
EUR 11.90
ESJOT sprocket 22 teeth (8 hole) | Hercules, Tomos, Zündapp Alpa Spezial 3000
Chain pitch: 1/2" x 3/16" · Chain type: 415H · Ø inside: 42.5 mm · Manufacturer: ESJOT · Material: Steel · Surface: varnished · Color: black · Thickness: 4 mm · Number of teeth: 22 pcs · Ø bolt circle: 60.5 mm · Ø bolt circle: 66 mm · Ø mounting hole: 7.4 mm · Number of fixing points: 4 pcs · Number of fixing points: 8 pcs
EUR 16.80
Piston 45 mm (12 mm KoBo) | Tomos A3 / A35
Ø outside piston (A): 44.94 mm · Compression height (C): 22 mm · Curvature (D): 4 mm · Nominal diameter: 45 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 · Weight piston kit: 91 g
EUR 42.10
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
