Question about 2005 Aprilia RS 125

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De-restrict an aprilia rs 125

How do you de-restrict an aprilia rs 125?

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  • mather123 Jan 08, 2009

    de-restrict an aprilia rs 125 problem

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    how to get the most out of an rs 125

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  • Anonymous Mar 26, 2014

    need to do a service on my aprilia and need to know what i need to do. so if you can help me out witha workshop manual thanks?

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Hate to disagree with tina783, but you may have restrictions in place, there is two on the aprilia rs 125. if your on a L plate then the bike should be restricted to 11.5w of power, which is about 15 bhp, when it's de-restricted should be around 34bhp. First is the power valve or a RAVE Valve as some people call it, have you got one? located on the front of the cylinder body, above the exhaust. some times the body of the power valve is there, but there is a blanking plate is underneath it. If the body of the power valve is missing, then its a blanking plate. need to get a power valve and the control unit and the solenoid, fitting is easy look around the net and you'll find one. The next one is the emissions restriction, which is in place due to italy have a real hard on about thier air. The CDI at the back of the back of the bike needs to removed and then if you look at one side you will see a rubber sealant has been used to fill in one side. You need to dig that out and snap a little piece of the circuit board and then refill the hole with a rubber sealant. try to search the net for a how to do on this you need to look at the pics and see what part of the board needs snapping, don't go blindly into this other wise you will kill the CDI. the bike then will act alot more smoothly in the lower end revs.

Posted on Aug 02, 2009

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You shouldn't have to restrictions only happen on faster bikes 600cc onwards but if you talking about the inabilty to push your revs to the very max, I wouldn't do this unless you know what you doing, and by you asking this question, you don't know what u doing, this rev restriction is set in place for safety of your engine, rather than restricting speed.,,,

Posted on Nov 10, 2008

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The procedure is not as simple as with the RS50. With the RS50 you buy the bike restricted, which means that it can only go at a maximum of 50 km/h and then after having done some 1000km you have the option to take off the restriction so it can function at its full power (100km/h), which is at the power it was designed to function. I don't know the exact details of this, but it has something to do with taking out a piece that is in the exhaust. The best option is to let an Aprilia dealer do this, as it only costs 100 Euro.
WIth the RS125 the procedure is quite complex and I don't think you should attempt to do it yourself. When you buy an RS125 it is restricted at 15HP, but not because of a simple stop in the exhaust, rather due to the whole configuration of components. The first step is buying the kit that Aprilia supplies for this, which costs around 700 Euro, and then let an Aprilia dealer install it. When you have done that you should have around 30HP (this is model 2006 onwards, the 2005 RS125 had 34HP and earlier models up to 38HP)

Posted on Jul 10, 2009

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Dose anybody know how to change time date month on aprilia sx125

Posted on Sep 28, 2013

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Af1 raceing would have all the info you would want to know i think its a great site for aprilia owners

Posted on Dec 29, 2008

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SOURCE: de-restricting aprilia rs 125 (jetting)

hi not putting you off but when i fitted a arrow exhaust system and power valve. i had great power. but i had to rebuild the engine every 800 - 1000 mls. regards

Posted on Jan 31, 2010

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De-restricting aprilia rs 125 (jetting)


hi not putting you off but when i fitted a arrow exhaust system and power valve. i had great power. but i had to rebuild the engine every 800 - 1000 mls. regards

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there's a rev limiter . Im not sure of your bike model but a simple google might help.

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Warning light


The warning light and EFI will disappear once you fit power valve :)

I've got 2008 Aprilia RS125 and CDI I derestricted first.. I had warning light on until I fitted power valve.. No warning light now.

Nov 23, 2008 | 2008 Aprilia RS 125

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