38 mm piston kit with two 1.5 mm rectangular piston rings with flank retention (FS) for your Tomos Funtastic, Funsport, or Roadie moped with an A55 engine.
You can find the detailed dimensions of the piston, as shown in the technical drawing, in the product details. You can also find information about the standard piston rings, their clearances, and retaining methods in the legend accompanying the images.
The piston kit includes the piston, piston pin, piston clips, and piston rings.
Note: The piston can also be used in Tomos mopeds with an A35 engine, provided that the intake and exhaust are also replaced.
You can find additional piston kits, the necessary installation tools, and, if needed, the matching cylinder in the accessories section.
A quality product from the Italian manufacturer Vertex.
| Nominal diameter | 38 mm |
| Manufacturer | Vertex |
| Ø outside piston (A) | 37.97 mm |
| Compression height (C) | 22.5 mm |
| Curvature (D) | 3 mm |
| Total piston height (E) | 52 mm |
| Number of piston rings (F) | 2 pcs |
| Piston ring impact | Flank safety device (FS) |
| Piston ring mold | Rectangular ring |
| Piston ring height | 1.5 mm |
| Ø piston pin (B) | 12 mm |
| Weight piston kit | 70 g |
| Tomos | Fun Sport'R Roadie |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Manufacturer: GPO · Area of application: (Dis)assembly tool · Material: Steel · Surface: burnished · Number of components: 7 pcs · Total length: 130 mm · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Width across flats: 10 mm · Width across flats: 17 mm
EUR 23.60
Airsal piston 38 mm (12 mm KoBo) | Tomos A35
Manufacturer: Airsal · Nominal diameter: 38 mm · Ø outside piston (A): 37.95 mm · Ø piston pin (B): 12 mm · Compression height (C): 22.5 mm · Curvature (D): 3.85 mm · Total piston height (E): 52.35 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
EUR 59.20
Airsal piston 44 mm (10 mm KoBo) | Tomos A35
Manufacturer: Airsal · Nominal diameter: 44 mm · Ø outside piston (A): 43.95 mm · Ø piston pin (B): 10 mm · Compression height (C): 21.1 mm · Curvature (D): 3.7 mm · Total piston height (E): 49.2 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 · Weight piston kit: 83 g
EUR 55.70
Airsal 44 mm piston (12 mm KoBo) | Tomos A55
Manufacturer: Airsal · Nominal diameter: 44 mm · Ø outside piston (A): 43.95 mm · Ø piston pin (B): 12 mm · Compression height (C): 22.2 mm · Curvature (D): 3.8 mm · Total piston height (E): 62.65 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 · Weight piston kit: 92 g
EUR 55.70
GPO piston 44 mm (12 mm KoBo) | Tomos A3/A35
Manufacturer: GPO · Nominal diameter: 44 mm · Ø outside piston (A): 43.96 mm · Ø piston pin (B): 12 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
EUR 45.00
Piston 45 mm (12 mm KoBo) | Tomos A3 / A35
Nominal diameter: 45 mm · Ø outside piston (A): 44.94 mm · Ø piston pin (B): 12 mm · Compression height (C): 22 mm · Curvature (D): 4 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 · Weight piston kit: 91 g
EUR 41.40
Vertex piston 39 mm (12 mm KoBo) oversize | Tomos A55
Manufacturer: Vertex · Nominal diameter: 39 mm · Ø outside piston (A): 38.95 mm · Ø piston pin (B): 12 mm · Compression height (C): 22.5 mm · Curvature (D): 3.5 mm · Total piston height (E): 50 mm · Number of piston rings (F): 2 pcs · Piston ring mold: L-ring · Piston ring mold: Rectangular ring · Piston ring impact: Flank safety device (FS) · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Piston ring height: 2 mm · Weight piston kit: 81 g
EUR 94.80
Explore categories from Piston
Moped fans also bought
Hot 
swiing® revival Stud Bolt, Inlet/Outlet M6x30 (Grade 10.9)
Diameter: 5.95 mm · Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Thread type: M6x1 (standard thread) · Nominal diameter (thread): 6 mm · Total length: 30 mm · Thread length: 12 mm · Strength class: 10.9
EUR 2.15
Fortune / Merrick 2.00-2.25 x 16" / 17" inner tube
Manufacturer: Fortune · Tire width: 2 - 2.5 " · Tire width: 2.25 - 2.5 " · Tire width: 2.5 " · Tire width [mm]: 50.8 - 63.5 · Width: 2 " · Width: 2 1/4 " · Width: 2 1/2 " · Tire height [%]: 100 · Old designation: 20 x 2 " · Old designation: 20 x 2.25 " · Old designation: 20 x 2.5 " · Old designation: 21 x 2 " · Old designation: 21 x 2.25 " · Old designation: 21 x 2.5 " · Valve type: TR4 Auto valve · Wheel size: 16 - 17 " · Wheel size: 17 " · Alternative version of the Puch OEM number: 567.060700 · Alternative version of the Puch OEM number: 901.0863 · Alternative version of the Puch OEM number: 902.0853
EUR 12.50
swiing® revival light switch MERIT two buttons
Manufacturer: GPO · Housing material: Steel · Surface: chrome-plated · Color: Chrome · Substructure material: Plastic · Color: black · Total length: 55 mm · Width: 27 mm · Functions: High beam (headlights) · Functions: Horn · Functions: Light off · Functions: Low beam · Functions: Motor stop · Height: 30 mm · Number of positions: 3 pcs · Ø Handlebars: 22 mm
EUR 22.40
ESJOT drive chain 415H (reinforced) 114L (1A quality)
Chain pitch: 1/2" x 3/16" · Chain type: 415H · Manufacturer: ESJOT · Material: Steel · Color: gray · Number of chain links: 114 pcs · Rolling circumference: 1448 mm · Chain lock type: Spring lock · Surface: blank / oiled · Ø bore: 4.05 mm · Ø Pin: 4 mm
EUR 22.40
swiing® revival gearbox cover gasket | Sachs 503 AAL, ABL, AB, AC, ADV, 2AL, 2BL (A1888)
Width: 130 mm · Total length: 200 mm · Manufacturer: swiing® revival parts · Material: Sealing paper · Number of components: 1 pcs · Thickness: 0.35 mm · Color: sand-colored · Number of fixing points: 6 pcs · Pony OEM number: A1888 · Sachs OEM no.: 0250 150 000
EUR 6.40
Dell'Orto 14/9 P SHA carburetor hand choke | Tomos
Manufacturer: Dell'Orto · Camouflaged: No · Component group Carburetor: Carburetor complete · Material: Aluminum · Color: black · Carburetor type: SHA · Nominal diameter: 9 mm · Nominal diameter: 14 mm · Ø Internal connection: 18 mm · Ø without reducing sleeve: 21 mm · Ø Inside entrance: 9 mm · Ø Output inside: 14 mm · Ø Air filter connection: 56 mm · Ø Air filter connection: 59 mm · Mixed oil connection: No · Vacuum connection: No · Choke control: Hand choke · Nozzle thread: M5x0.8 (standard thread) · Nozzle size: 49 · Mounting type: Plug connection clamped · Total length: 58 mm · Width: 90 mm · Height: 82 mm · Area of application: Original · Tomos OEM number: 1236202
EUR 101.90
Working late? Evening hours on Thursday until 20:00
