Aprilia RS660 Chiptuning Stage 1 Performancethe RS 660 stole the headlines as a modern equivalent to the RS250 two stroke and a step away from a litre sports bikes, to provide something as comfortable on a twisty A road as on track. Since then it has won numerous awards including MCN bike of the year and it has won the super twins cup in the USA. Weighing in at only 169kg, the 100hp 660s parallel twin engine is derived from the front two cylinders on the RSV4 1100 Factory but in this chassis,
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