Question about 2000 Aprilia RS 125

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I got an aprilia rs125.i put an new piston and bearing but now i got 2 bum start it then it cuts out can u tell me why please

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  • laura cortez
    laura cortez Dec 31, 2010

    I am going to need a little more info please? Why did you put a new piston and bearing in? How does it run after bump starting it? Does it Idle? Have you checked your wires and timing?



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I assume "bum start" means you have to push or kick start the bike, rather than electric start it. If you put in a high performance/larger piston then you may just have a higher compression that the starter can't turn over. If it was stock, then there may be several possible problems. Make sure your piston is in correctly. There is an arrow or a mark on top of the piston that should be pointed toward the exhaust side. Also, if it is a 2 ring piston, there is a top and a bottom ring, and an upside and a downside to each ring. There is often a "t" on the topside of each piston ring to indicate which side is up. As for which is ring one and ring two, I'd have to see the rings, but usually, they are a different thickness so it is easy to tell which one is the first vs the 2nd ring. Any Aprilia dealer should also be able to tell you. There are other possibilities, but I'd start here. Good luck.

Posted on Jan 03, 2011


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