38.5 mm oversize piston with a 1.5 mm rectangular piston ring with flank seal (FS) and a 2 mm L-ring piston ring with internal seal (IS) for your Puch moped as well as the Tomos Funtastic, Funsport, or Roadie moped with an A55 engine.
You’ll find the detailed piston dimensions, as shown in the technical drawing, in the product details. You can also find information about common piston rings, their contact surfaces, and retaining types in the legend accompanying the images.
The package includes the piston, piston pins, piston clips, and piston rings.
Notes:
Please observe the installation direction during assembly. The piston is installed with the arrow pointing toward the exhaust on the exhaust side.
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 alternatives in the accessories section.
A quality product from the Italian manufacturer Vertex.
| Manufacturer | Vertex |
| Ø outside piston (A) | 38.45 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 |
| Nominal diameter | 38.5 mm |
| 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 |
| Ø piston pin (B) | 12 mm |
| Weight piston kit | 77 g |
| Puch | |
| Tomos | Fun Sport'R Roadie |
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