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.
| Manufacturer | Vertex |
| Nominal diameter | 38 mm |
| 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 mold | Rectangular ring |
| Ø piston pin (B) | 12 mm |
| Piston ring impact | Flank safety device (FS) |
| Piston ring height | 1.5 mm |
| Weight piston kit | 70 g |
| Tomos | Fun Sport'R Roadie |
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