38.5 mm &overmass piston with 1.5 mm rectangular piston ring with flank lock (FS) and 2 mm L-ring piston ring with internal lock (IS) for your Tomos Funtastic, Funsport, Roadie moped / moped with A55 engine.
The detailed dimensioning 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.
The piston kit contains pistons, piston pins, piston clips and piston rings.
Note: The piston can also be used on Tomos mopeds with an A35 engine, provided the intake and exhaust are also replaced.
Further piston kits, corresponding assembly tools and alternatives can be found in the accessories section.
Quality product from the Italian manufacturer Vertex.
Details
| Manufacturer | Vertex |
| Nominal diameter | 38.5 mm |
| Ø outside piston (A) | 38.45 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 | Rectangular ring, L-ring |
| Piston ring impact | Flank safety device (FS), Internal fuse (IS) |
| Piston ring height | 2 mm, 1.5 mm |
Suitable for the following models
| Tomos | FunSport Roadie |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Width across flats SW: 10 mm · Width across flats SW: 17 mm · Total length: 130 mm · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Manufacturer: GPO · Area of application: (Dis)assembly tool · Material: Steel · Surface: burnished · Number of components: 7 pcs
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Airsal piston 38 mm (12 mm KoBo) | Tomos A35
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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
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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
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Vertex piston 38 mm (12 mm KoBo) type B | Tomos A55
Manufacturer: Vertex · Nominal diameter: 38 mm · Ø outside piston (A): 37.97 mm · Ø piston pin (B): 12 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 mold: Rectangular ring · Piston ring impact: Flank safety device (FS) · Piston ring height: 1.5 mm
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Vertex piston 39.0 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
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Collection only possible with online purchase and appointment.
