Malossi Sport 50ccm cylinder kit (40 mm) for Piaggio AC – noticeably more power in everyday use

Malossi also offers a cylinder with a standard bore of 40 mm – however, with clear performance optimization. Through optimized port timing and an enlarged exhaust port, this grey cast iron cylinder delivers approximately 2–3 hp more than a standard cylinder, depending on the setup. Perfect if you want to upgrade your Piaggio AC engine (e.g., in the Piaggio Zip 50, Vespa LX 50 2-stroke or Aprilia SR 50 Motard AC) in a reliable and everyday-suitable manner.

The kit is delivered including all parts such as gasket, piston and head. The cylinder harmonizes particularly well with exhaust systems such as Yasuni Z or Laser XPro – ideal for a balanced setup with sportier acceleration.

Advantages & Features

• 50ccm sport cylinder with standard bore 40 mm
• Optimized port timing for better filling and performance
• Enlarged exhaust port for noticeably freer revving
• Grey cast iron for robust, proven durability in everyday use
• Power increase of approx. 2–3 hp compared to standard cylinder (depending on setup)
• Top combination with Yasuni Z or Laser XPro

Scope of Delivery

• Cylinder (grey cast iron)
• Piston
• Cylinder head
• Gaskets

Technical Details

• Displacement: 50 ccm
• Bore: 40 mm (standard bore)
• Engine type: Piaggio AC (air-cooled)
• Material: Grey cast iron

Compatibility (Excerpt)

Fits many vehicles with Piaggio AC engine, e.g., Piaggio Zip 2 50 2-stroke, Vespa Primavera 50 2-stroke, Vespa LX 50 2-stroke as well as models from Aprilia (e.g., SR 50 Motard AC Air) and Gilera (e.g., Stalker / Typhoon). Please be sure to compare your engine/type with the vehicle list before purchasing.

OEM Numbers (for comparison purposes)

• 31 8520
• 318520

Why Malossi?

Malossi has stood for well-thought-out sport setups with clean manufacturing quality for years. This exact kit is ideal if you want to get more out of your Piaggio Zip 50, your Vespa LX 50 2-stroke or another Piaggio AC scooter – without going directly to uncompromising racing hardware.