Malossi 183cc Cylinder Kit Vespa GTS 125, Aprilia SR 125 GT (model year 2017)

The Malossi 183cc cylinder kit is a high-performance upgrade for modern 4-stroke scooters and was developed to maximize power output and thermal stability. The increased displacement significantly improves acceleration, while the optimized cooling and airflow characteristics ensure consistent performance.

Manufactured from a high-quality aluminum-silicon alloy with a Nikasil coating, the cylinder offers minimal friction and high wear resistance. Combined with the lightweight 3-ring piston, this creates a durable and robust setup for sporty applications.

Technical Specifications

• Product: Cylinder kit
• Displacement: 183 cc
• Bore: Ø 63 mm
• Stroke: 58.7 mm
• Compression ratio: 11.48:1
• Cylinder material: Aluminum with Nikasil coating
• Piston: Aluminum, 3-ring system
• Precision machining (CNC)

Fits:

• Aprilia SR GT 125 / 200 (2022–2025)
• Aprilia SR GT Sport 125 / 200 (2022–2025)
• Piaggio Medley 125 / 150 (2016–2025)
• Piaggio Medley S 125 / 150 (2020–2025)
• Vespa GTS 125 / 150 (2017–2025)
• Vespa GTS Super / Super Sport / Super Tech 125 / 150 (2017–2025)

Note

• Installation only in combination with Malossi Force Master control unit
• Depending on the vehicle, a specific ECU is required:
• Force Master 5517738 → Medley 125 (2016–2019), Vespa GTS 125 / Super 125 Euro 4
• Force Master 5518182 → Medley 150 (2016–2019), Vespa GTS 150 / Super 150 Euro 4
• Force Master 5518844 → Medley 125 / 150 (from 2020 Euro 4), Medley S 125 / 150
• Force Master 5519463 → SR GT 125, Medley 125 / 150 Euro 5, Vespa GTS 125 / 150 Euro 5 (2021–2025)
• For Euro 5 models, chain tensioner part no. 1819744B is also required
• Not approved for use on public roads

Scope of delivery

• 1x Cylinder Ø 63 mm
• 1x Piston incl. piston rings
• 1x piston pin + clips
• 1x gasket set