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I bought the bike as my second after learning on a Derbi Gpr50, a great bike in it's own right. The Rs125 is a great bike in many ways i love it because it handles so well and is very light and user friendly (once used to 2 stroke clutch slipping starts). The bike begs to be screamed every where you go and is only really happy once above 7.5k revs where it will sit all day as long as the maintenance schedule is followed religiously and Fully synthetic oil is used. (I recommend Motul 710 Fully Synthetic).IRO £13 a litre
The only slight downside to the bike are the high maintenance in order to keep them reliable. Some younger more immature riders who don't take care will report back the Rs being unreliable but this is mainlyl to due to negligance. However for me i find doing the maintenance work on the bike fairly easy and there are maintenance manuals out there for the vehicle which makes doing most jobs on the bike DIY able. I recently fitted a new piston and rings myself cost for parts around £100.
I think the RS fast enough for a 125cc and think that it is best off left standard as it is highly strung enough as it is and best left modified only for race series's where frequent engine rebuilds arn't a problem. Depending on the year though certain parts can be fitted genuine aprilia parts to create the fastest stock RS. Thinks like decatted origianl exhaust and 34mm carb for example. I can recommend a good set of tyres i have been using the d209GP's very very sticky but i don't like to compromise on the only thing keeping me upright :).
Some perfomance stats which i have done myself off road are 0-60 -6.5s 99 on a flat -Wind dependant and wider weight dependant
The figures are excellent for a 125 but i find most the fun in the bike is keeping it in to 8-11.5k sweetspot (powerband) and blasting through a good set of twisties. The handling and feel through the suspension/chassis gives me real confidence to corner at speed and the brakes are also reassuringly good. (ebc sintered pads recommended upgrade here for more bite but the stock pads arn't bad)