Aprilia RS 125 derestricting HELP!!

[steve8137]

Hey!!

Firstly can i say thanks to everyone that helped me yesterday with my power valve, grrr. It's working great now, the acceleration is immense i love it!!

But here's what i want to ask, im tying to fully derestrict my Aprilia RS 125 and get it going as fast as i can. I am going to buy a Jim Lomas exhaust.

What else needs to be done, and how do i do it? I think theres something with the CDI unit isn't there?

Thanks!!

[Villers]

Just search 'Aprilia RS125 CDI Unit Modification' on the internet to find out exactly what it is and how to do it.

Basically its retardation at a certain revs, wont specify which part of the revs because Kickstart will come along and correct me with his vast rotax knowledge , to do with the european emmission regualtions. The modification includes removing the CDI, removing the sealing at the back to expose a 'bridge wire' and cutting it. Re-seal, refit the CDI and bingo youre done.


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RS125 > CBR6 > SV650S > ZX636R > GSX1300RZ Hayabusa > 06 RSVR Mille > SV1000S > Street Triple 765 RS

[Keith]

A race exhaust isnt necessary to de-restrict the bike, but it'll certainly make it sound nicer and rev far cleaner.

The CDI retard doesnt effect performance, it just cough and splutters around the 5000rpm mark, after that, it'll scream all the way to redline, problem free. If you fancy removing it, check the RS125 Zone as it tells you exactly what needs to be done. Quite a simple procedure, but not that necessary. Personally, I'd get another CDI off ebay and tear that one up, that way you wont do any damage to your own should you break more than one wire.
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike

[Villers]

Certain models of the RS125 did contain a restriction, a full system would solve some of these issues.

In the short term if you find the engine dying at 5500 to 6500 revs then slip the clutch slightly to get through it, it can be a pain in the arse overtaking when it feels like you have run out of puff!

**I know I said I wouldnt mention which revs it was but I thought I would take a guess anyway!
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RS125 > CBR6 > SV650S > ZX636R > GSX1300RZ Hayabusa > 06 RSVR Mille > SV1000S > Street Triple 765 RS

[Keith]

The latest models (2004 onwards) have the catalytic convertor in the end can, certainly chokes things up a bit. Simple methods of getting rid are buying a silencer from an older bike or a "race" silencer, something like a JL or arrow will do the trick.
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike

[Kickstart]

Hi

It is only the last couple of years where the exhausts have been a bit shit.

The flat spot caused by the cdi unit is massive. The bikes generally have difficulty pulling through it in any gear. Somewhere I have a graph showing the ignition curve for the RS125, and it is something stupid like 15 degrees of ignition retard between 5000 and 6000rpm.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Villers]

Told you he'd do that

The bloke knows all with these engines!
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RS125 > CBR6 > SV650S > ZX636R > GSX1300RZ Hayabusa > 06 RSVR Mille > SV1000S > Street Triple 765 RS

[pandapop]

https://www.digital-stroke.com/sportbikes/modifications/aprilia-125rs-cdi-de-restrict.html