Speedo problem again.

[gelbeRS]

Hi Kit, if the speedo shows speed when turning backwards, I suppose that the sheet metal part with the 2 teeth in the frontwheel could be damaged too.
Juergen

[thap8riot]

Originally Posted by KitNYC

Vielen dank, Juergen! I'll be in touch if it tests bad.

Thanks, thap8riot. I just don't understand how the sensor could've been damaged, as it's been several months and thousands of miles since I've touched the front wheel.

Also, here's an additional data point: the speedo registers moving backward just as it always has; it's only moving forward that's glitchy.

Cheers,
-Kit

I don't remember how long mine took to go bad. I know that the 2 teeth were bent and not in the magnet slots but were still turning the magnet. It took a while for the pressure to crack the magnet. Again, I don't remember how long that took, but it may have been several weeks and 1000 or more miles. Let us know what you find.

[KitNYC]

Well, this seems to be why my speedo was erratic:



Note that the edges of the cracks obviously used to line up, but are much too worn to do so any more. I've dressed the driven edges with a file until I can spare the cash for one of Juergen's alloy/neodymium rings; it works for the moment.

Cheers,
-Kit

[KitNYC]

Well, dressing the edges of the magnet with a file worked for about 50 miles.

I got the part from Germany today and it worked great, for six miles.

Time to look at the drive ring, I guess...

[gelbeRS]

Did you put grease to the ring from all sides?

[KitNYC]

Yes, lots of grease. I'm about to go pull it apart again; I'll try to get some pics as well.

Cheers,
-Kit

[KitNYC]

Greasy speedo ring:



Drive ring in hub:


Drive ring out of hub and cleaned up:


More drive ring:


Drive ring straightened, drive edges dressed w/ file:


The new magnet ring is locked up tight inside the sender housing. It will not move.

[gelbeRS]

Please take a photo from the cleaned ring in the housing. I sold more than 50 of them in 2 years and nobody mentioned any probs, so I am very interested in a solution and to find out the reason. Can you move the ring with force?
Juergen

[KitNYC]

Here are some pics of the magnet ring with the grease removed:











I used penetrating oil and this setup to try to move it; it does not move.



Currently riding with the drive ring removed.

[gelbeRS]

It seems, that the drive ring has overrun the grooves in the magnet ring and deformed it. I think, the straightened drive ring will work right with a new magnet ring. I'll send a new one for free.
Juergen