TOP PERFORMANCE Black Trophy Cylinder Kit - Big Bore (manufacturer part number: 9931270)
Designed for 50cc 2T scooters looking to upgrade to 71cc, this TOP PERFORMANCE Big Bore kit includes the essential components for a serious upper engine adaptation. Careful materials and technical finishes ensure a durable installation for urban and city use.
Kit contents:
- 1 cylinder Ø 48 mm made of "MINACROM" cast iron (chrome-enriched alloy)
- 1 piston Ø 48 mm high silicon content, Molybdenum Disulphide surface treatment
- 1 upper chrome ring and lower rings Ø 48
- shaft and circlips, head, O-rings and cylinder head gaskets, aluminum connector and fasteners
- mounting brackets Ø 12-22 & Ø 16-25 and 2 bolts M6 x 20
Technical specifications:
- Bore: 48 mm
- Stroke: 39.3 mm
- Displacement: 71 cm³
- Compression ratio: 1 : 12.3
- Piston compression: Racing
- Material (parts): MINACROM cast iron / aluminum components
Compatible with several 50cc 2T scooters (e.g., APRILIA SR 50 R FACTORY 2014, PIAGGIO ZIP 50 2T SP 2013, GILERA RUNNER 50 SP 2012). Installation is recommended by a qualified workshop to ensure proper timing, gaskets, and carburetor/exhaust adjustments. TOP PERFORMANCE product suitable for riders looking for a reliable and complete big bore kit for urban use.
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