Thread: Speed meter
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Old 05-12-2014, 02:10 PM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: Speed meter

Originally Posted by Scol View Post
I have a wireless speed meter it reads normal when I’m cycling but when the engine is on it’s readings are wrong it keeps jumping to random numbers.

The engine is affecting the reading. Should I change this to a wired unit ? or is there a quick fix ? I was think of putting some insulation tape on the handle bars because then I take the unit off the handle bars it seem to work OK and get a good reading from the sensor on the wheel so It must be picking up some interference from the engine through the frame. I have a wired speed meter on another bike I could change it no problem but before I do are all speed meters affected by the engine ?

mount ignition coi/CDIl as far from front of bike as possible away from speedometer so there isn't RF interference, with a wireless speedometer I mount my coil on the seat down tube and just extend my wires and use a longer spark plug wire if needed, I use the cheapy wireless speedos I buy on ebay and been using them since 2009, units only cost $10 or less and work great when CDI is mounted behind engine on seat down tube.

Here is the speedo I use

This other one I listed below is a wired model that I have and it works excellent also for about the same $'s

Attached Images
File Type: jpg wireless speedo.jpg (146.8 KB, 32 views)
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!

Last edited by mapbike; 05-12-2014 at 02:15 PM.
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