Question about 1998 Aprilia RS 125 Extrema

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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 connected snorkles out?? help!

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  • sxy_andy69 May 11, 2010

    try cleaning the power valve and put a new plug and cap in



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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.

Posted on Apr 06, 2010


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