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Aprila rs 125 05 extrema powervalve arrow exhaust

Aprila rs 125 05 extrema powervalve arrow exhaust cuts out often with loss of electrics on dash once it cooks down starts fine anyone know why please only got 80mph and only got 93 mph downhill with wind behind just brought and read it should be quicker and more reliable any one help I've read lots on forms but garage can't say unless they strip everything down which would cost to much they are bit money hungry and been know to tip people off if given chance and outhers are still expensive and busy please leave comment it all helps bikes still very fast and I know a few things about machanics but won't touch as no tools for you tube vids on stripping

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  • Motorcycles Master
  • 3,799 Answers

If you have only owned for a very short while, you should not have to pay for repairs as you have a 3 month warranty (in the UK anyway) You might want to get a second opinion from a recovery company (AA or RAC in the UK). Incidentally just because someone has said it will be faster will all depend on how the previous owner looked after it.92 MPH is very quick for a 125.

Posted on Apr 25, 2013

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Posted on Jan 02, 2017

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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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Posted on Apr 30, 2010

burgessjay69
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SOURCE: RS 125 Engine Tapping Sound

hi
being a teo stroke these engines dony last long the aprilia has a high engine fail rate the noise is most prob the big end or small end bearings as these are common to go on this bike the main bearings make a rummbley scraping noise on idle best to get it looked at as when these go bangh thay can destroy the crank case too
cheers jay

Posted on Jun 27, 2009

czaa
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Posted on Sep 05, 2009

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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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You need to box that thing up and ship it to me immediately. I will get to it and back in your hands no latter then say......2012...2013 at the latest.

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Pull your plug after you try to start it. What does it look like? If it's wet your problem is flooding, electrical or bad fuel. If it's dry your not getting fuel.
After you check the plug please repost here with what you find and I can help you out with a more specific cause.

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The bike does not hit thepower band


Need to know the year of the bike,but you may find that your powervalve is not working or lifting up to open the exhaust port fully.Does it rev cleanly otherwise?You could also have a carb issue if it doesn't.

I also find that if the bike has a high mileage the carbon build up in the expansion chamber will be too much and then it will need to be burnt out...this can improve the performance significantly.

Please leave some positive feedback for me if this solves your problem and get back to me if you need to.

Thanks

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S reg aprilia rs 125 derestrited misfires between 5500 and 7200rpm then takes off like a rocket its a 122 with 28mm carb starts and idles great checked jet in bowl bolt says 120 cdi bin cut power valve...


You have upset the air fuel flow by changing the exhaust, I would try placing a piece of paper over the air filter to change the intake first, to see what happens, then if that doesn't work, you will need to rejet, and sometimes the factory setting won't work, so you will need an adj jet, Find an aftermarket for your carb I think dyno tune has one. They work great. I hope this helps.

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