Question about 2003 Aprilia Atlantic 500

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SC250ie speedometer trouble

I got aSC250ie the first of August. At 1050 miles the speedo started drooping momentarily. The first couple of times it happened while I was going 50 to 60 in clear weather. thought it was a bad speed sensor. Got some experience with hall effect sensors that can miss pulses if the air gap is set wrong

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And the like. BUT... Today leaving work the speedometer moved on its own sitting still with the engine at idle. It went as high as 70! doubt that's a speed nsor since there should be a frequency signal of zero. I plan to fix it myself since taking it to the dealer is a 12 hour proposition, 3 hours each way x two trips. Maybe they'll work with me on warrantying the parts anyway. Any experience with this kind of issue? I am thinking the instrument panel is bad. The speed sensor feeds directly into the IP. Open to suggestions if any good ones come my way. Other than this the scoot has run just fine.,I think you should check your connections between the speed sensor and the speedo as well as your grounds. the speedo is just a small motor w a stick on it. when you reattach the battery it does a self test from 0 to as high as it goes. so your intermittent speedo problems are imho probably caused by some kind of electrical interference. the shop manual is on this site for free download, do a search and you will find it. I would also guess that perhaps u have a wire that rubbed through the insulation somewhere. good luck!,,,

Posted on Nov 10, 2008


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