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Old 02-14-2010, 01:34 PM
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Earthman Earthman is offline
Motorized Bicycle Senior Member
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 82
Default Re: Problem with electronic Speedometer

Apparently, the ignition wire (CDI to spark plug) is junk on these kits. I had the same problem and put a clip-on ferrite bead near the speedometer to block the RFI from the engine's ignition system. That fixed the problem about 90% of the time. However, based on advice received form others on the forum, I also replaced the stock spark plug wire with an inexpensive automotive ignition coil to distributor cable (a spark plug wire would work as well). This fixed the problem and may be all you need to do. The ignition cable was less than $10 and was long enough that I could cut it in half - ending up with two ignition wires. Try replacing the ignition wire first - turn the existing wire CCW to disconnect from the DCI, turn the new wire CW to connect to the CDI. If that doesn't work, try shielding the speedometer wire and/or adding a clip-on ferrite bead from RadioShack.
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Last edited by Earthman; 02-14-2010 at 01:37 PM.
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