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post #1 of 3 Old 02-02-2014, 06:43 PM Thread Starter
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Join Date: Apr 2010
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Speedo swap

My original speedo/odo died on me awhile back. Through the generoisty of a member here I acquired an entire instrument cluster.

It's pretty easy to get the dash apart. The service manual details the procedure.

Because I had another instrument cluster I wasn't too concerned about destroying the old one and I did taking it apart!

(All the pics are of the old speedo. BTW The original unit's gears were a bit chewed up and it clicked when the cable turned but the needle didn't move)

This is the face on view. The small shaft in the middle drives the needle.

I was planning on resetting the new odo to my original's mileage (a difference of about 30K miles). Problem was I couldn't get the unit apart. All the assemblies are staked into place preventing tampering, er... adjusting!

So admitting defeat I endeavored to understand how the unit worked. The cable turns the white worm gear. The odo is gear driven through the series of gears.

Pretty straight foward but the speedo hmm how the heck does that work. There is a magnetic disk directly attached to the white worm gear. The cable spins the disk. The disk sits inside an alluminum cup but doesn't touch the cup. The cup is attached to a shaft that turns the speedo needle. There is weird looking spring attached to the same shaft. WTH?

Googled: It's an "eddy current speedo" basically the spinning magnet creates electric currents that move in the direction of rotation which cause the "speed cup" to turn. The "hair spring" provides resitance to the cup and returns the needle to zero.

Here's a page that explains: How do speedometers work

I'm guessing that the magnetic strength of the disk varies (from unit to unit) so that would explain the speedo error and the differences between bikes. My original unit was 10% optomistic.

One more thing the trip reset. It's gear driven but it's spring loaded to reset to zero when the gears are disengaged:

The new cluster is installed and it gave me a chance to clean up my wiring mods (heated grips, GPS, conspicuity lights). I originally used the crimp on wire splice deals and they were getting flakey. Lesson learned I soldered and shrink wrapped the splices.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9

Last edited by Spec; 02-02-2014 at 09:58 PM.
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post #2 of 3 Old 02-02-2014, 08:19 PM
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Jeezy petes....I'm on the road for work and trying to quote your post concerning the eddy current speedo and this abysmally ineffective touchpad of the HP is being problematic. Gosh, I miss my old Think Pad, but again, I digress from the subject.

Onwards. I realize this has nothing to do with resetting your odo but the eddy current speedo mention got me thinking of an article I read some time ago of calibrating the speedo without compromising the odo by de-gaussing the speed cup. Allowing an accurate indicated speed to mileage. Just a thought while you are in there already.

However, I cannot find that article to cite for reference. Anybody?

Gray-haired riders donít get that way from pure luck.

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post #3 of 3 Old 02-03-2014, 12:08 PM Thread Starter
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Location: Gateway to Death Valley!
Posts: 1,928
The new speedo/odo is working along with the tach and temp! Hah didn't break anything installing it.

It was mostly the odo I was wanting to keep track of gas in the tank and oil changes. I have a GPS for speed and yea I could have keep the mileage on it but that would have required forethought!

The speedo error is almost the same as my old unit, 10%. Makes it easy to calculate on the fly. Funny when I first got the bike cars were always tailgaiting me, then I got a GPS!

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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