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post #1 of 8 (permalink) Old 05-20-2015, 08:55 AM Thread Starter
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Erratic speedo

Last weekend I went out for a ride and at one point I looked down and the speedo was reading 220KM/HR and I was not even close. What I found is at higher speeds the speedo would jump to a much higher reading then compared to my GPS. Has anyone run into a similar situation?
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post #2 of 8 (permalink) Old 05-20-2015, 11:12 AM
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Yep, it was the speedo-sensor located on the back of the motor, behind the rear shock. Mine would jump around erratic and eventually just read 0 all the time - weee free milage :-)

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post #3 of 8 (permalink) Old 05-20-2015, 01:04 PM Thread Starter
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Originally Posted by Hanberg View Post
Yep, it was the speedo-sensor located on the back of the motor, behind the rear shock. Mine would jump around erratic and eventually just read 0 all the time - weee free milage :-)
Good to know. Was it easy to get to and replace? It looks like it is around $60.
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post #4 of 8 (permalink) Old 05-20-2015, 01:11 PM
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Wasn't much trouble. Unless you have big hands :-)

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post #5 of 8 (permalink) Old 05-20-2015, 01:52 PM Thread Starter
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Honda Canada is out of stock until July so ebay it is. Thanks again.
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post #6 of 8 (permalink) Old 05-20-2015, 03:17 PM
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A few things to be aware of;

The sensors can be had for $20 on eBay
The sensor may not be bad
There may be corrosion at any one of a number of harness connections. (from sensor to main harness, from harness to computer, from computer back to main harness, from main harness to front harness, and from front harness to cluster assembly)
Corrosion can also occur inside the cluster and on one of the PCB boards and or the rubber connecting strip.

I had an erratic speedo, eventually having it read 0mph all the time. I purchased a new circuit board, installed a new sensor, cleaned the old board, and wiggled wires everywhere before finding corrosion at the front harness connector at the pink/green wire. I'm still not 100% certain it is fixed, but the corrosion was cleaned off and it is now working on the stands.

<edit> And yeah, if you have big hands, the sensor is a PITFA to get to and you will need socket extensions and a swivel to make life easy.

Last edited by MikeinCtown; 05-20-2015 at 03:20 PM.
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post #7 of 8 (permalink) Old 05-20-2015, 09:09 PM Thread Starter
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Good information Mike. Did you use a spray to clean the corrosion?
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post #8 of 8 (permalink) Old 05-21-2015, 06:02 AM
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I did. I used electric contact cleaner and a toothbrush. You can get a spray safe for electrics and plastics at an r/c car place. Make sure you disconnect the battery before messing with the contacts.
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