Malossi Cast-Iron Cylinder ø 40 Pin ø 10 Cylinder-piston kitRef : MAL00507A / 1129975

MALOSSI Cast Cylinder Kit Ø40 – manufacturer ref. 31 6901. This thermal group is the entry-level solution for 50 cm3 2T modifications: bore Ø40 to increase displacement and utilize your engine's character differently.

• Construction: cast iron cylinder, designed for robustness and longevity in intensive use.
• Architecture: 6 transfers – 2-segment piston, assembly machined according to Malossi's strict tolerances.
• Diameter: Ø 40 mm.
• Homologation: track use only (not road approved).

Suitable for urban modifications and track use, this kit is aimed at riders seeking a reliable improvement without excessive complexity. It maintains a design compatible with many original exhausts and components, provided that fitting and necessary adaptations are checked.

Compatibility and installation: several scooters and mopeds 50 2T (e.g., YAMAHA ZUMA, MBK BOOSTER, ITALJET YANKEE) are among the common applications. Depending on the model, installation may require piston ref. 34 8538 if the crankshaft has a Ø12 axis, or the pivot/nut kit ref. 2012859 for certain machines; check before installation.

Workshop advice: entrust the installation and timing to a professional to ensure sealing, carburetion adjustments, and safety. Comply with local regulations regarding track use.