38.4 mm aluminum cylinder with 50 cc displacement from the Italian brand manufacturer Athena Piaggio Ciao, Si, Bravo and Boxer mopeds / mopeds.
The cylinder is made of a special aluminum alloy. The running surface
| Nominal diameter | 38.4 mm | 
| Manufacturer | Athena | 
| Material | Aluminum | 
| Area of application | Tuning | 
| Surface | sandblasted | 
| Displacement | 50 ccm | 
| Crankshaft stroke | 43 mm | 
| Ø cylinder neck | 45.7 mm | 
| Ø Outlet outside | 22.5 mm | 
| Ø outlet inside | 18 mm | 
| Ø piston pin (B) | 10 mm | 
| Outlet type | clamped | 
| Number of fixing points | 3 pcs | 
| Hole pattern [mm] | 35 x 55 | 
| Decompressor | Yes | 
| Camouflaged | No | 
| Piaggio | Ciao - P, SC, PX, C24 Si Bravo / Super Bravo Boxer Grillo | 
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