Things that might help you for the Aprilia RS 125 – from my former website (sonic-rs.de) online again. I’m looking forwar to suggestions, questions and feedback – just use the comments function.

Please note: This is a translated version of the original site and work in progress (Nov. 2019). Everything that is linked is translated and everything that is not isn’t.

General

  • What to know about the RS 125
  • A guide for buying a used bike
  • Maximum speed, like “I’m going 120 mph”
  • Enginge warming-up
  • Dethrotteling and unrestricted bike
  • Differ Rotax 122 and Rotax 123 from the outside

Repair and Workshop Tips

Good to know for self-repair

  • Reset Service display (RS 125 after Bj. ’06)
  • Compression Ratio and Compression Pressure
  • Overview: Electronic Control Units
  • Remove Power Gap from 071000-0910 QCA91
  • Carburetor Setups for Dell Orto PHBH 28
  • Carburetor Setups for Dell Orto VHSB 34

Accessories

  • Stage6 Exhaust Gas Temperature Meter
  • LED Turn Indicator Lights
  • Installation Manual for Domino short stroke thottle handle
  • Tuning Manual
  • Polini 154 cm³ big bore test
  • Pneumatic RAVE2

Acknowledgements

I owe a considerable part of the knowledge and my experiences that I share here to people who have shared this with me and wide parts of the internet.

In particular, in Apriliaforum.de these were besides the great team Persilia, DellOrto, Kojo125, Mooserider and many others. Thanks to everyone in the German Two-Stroke-forum, especially moe589, for what is readable and freely available for everyone there.

Why the RS 125?

When I was 18 when I got my motorcycle driving license, it was limited to 34 hp for the first few years, so an unrestricted RS 125 fitted well for the beginning. That was 2007. As a moderator under the nickname “sonic.noize” I was able to make a name for myself on Apriliaforum.de, had a website and worked myself relatively deeply into the topic. Since the whole pages (sonic-rs.de as well as Apriliaforum.de itself) are offline now, I dug up the old slats again and put them online again – maybe it’s still of interest for someone.

After a few years, I became less and less interested in the topic. I’ve always been fascinated by technology, precise work is kind of satisfying but loud exhaust systems and a life for the leaning position didn’t appeal to me as much, I could enjoy nature better on the bike.

As a motorcyclist you unfortunately have a hard time when you can’t get anything out of empty rear silencers (that’s just ruthless, it’s unbelievable when you unfortunately live next to such a popular road) or just don’t want to heat up like a madman around curves that are hard to see. I always found restored vintage cars more fascinating than worn tyres. Also the tone in some internet forums was too outrageous for me at some point, which is why I withdrew almost completely from this topic. Everybody knows everything best, does everything right, everybody else is a retard and has no idea and is insulted in general.

However, I still like to work on machines and engines, nobody can take this fun away from me, and I am a convinced two-wheeled cyclist – especially in times when cars are getting bigger and bigger. Effective technology fascinates. While the big SUVs, which are unfortunately in use today, need far more than 10 litres per 100 km, the small RS4 125 still does it with less than 3 litres/100 km.

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