RS 50 / Aprilia
Aprilia RS 50 (1992-2005):
- AF1 model code
- Engine type: Minarelli AM6
Serial numbers: start with ZD4PU0000RS, ZD4PV0000RS or ZD4RR0000RS
Aprilia RS 50 (2006-2010):
- RS50 model code
- Engine type: Derbi D50B0
- Serial numbers: start with ZD4KG0000 or ZD4RK0000
Aprilia RS 50 (2011-present):
- RS4 model code
- Engine type: Derbi D50B0
- Serial numbers: start with ZD4VFB00 or ZD4VFL00
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