High-quality 40 mm racing kit for your Puch Supermaxi, Monza, and X50-4 moped.
The precision-machined aluminum cylinder impresses with its first-class workmanship and suitability for everyday use—perfect for sporty rides with maximum reliability.
Thanks to its advanced nickel-silicon carbide coating (commonly known as Nikasil), this racing cylinder offers excellent durability and optimal heat dissipation.
Visually, the cylinder has a low-key design and looks like a stock part at first glance. This 55 cc tuning cylinder is ideal for anyone who values a discreet setup.
Included in the package, in addition to the cylinder, are the complete piston kit and all gaskets.
Notes: The manufacturer specifies the cylinder head as delivering 7 PS, which serves as a distinguishing feature for this cylinder. However, we do not know under what setup conditions this 7 PS is achieved. Please observe the installation direction during assembly. The piston is installed with the arrow pointing toward the exhaust on the exhaust side.
You can find the matching cylinder head, as well as tuning carburetors and exhaust systems, in the accessories section.
| Nominal diameter | 40 mm |
| Material | Aluminum |
| Surface | Nickel silicon carbide (colloquially known as Nikasil) |
| Displacement | 55 ccm |
| Crankshaft stroke | 43 mm |
| Ø cylinder neck | 43 mm |
| Ø Inlet inside | 17 mm |
| Ø piston pin (B) | 12 mm |
| Ø outlet inside | 21 mm |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing outlet | 42 mm |
| Outlet type | slanted |
| Thread outlet | M6x1 (standard thread) |
| Hole pattern [mm] | 44 |
| Number of fixing points | 4 pcs |
| Camouflaged | No |
| Area of application | Tuning |
| Hole spacing inlet | 25 mm, 38 mm |
| Puch | E50 ZA50 (air-cooled) |
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