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Why might my speedo be failing?

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Athame57:
A couple of weeks ago my speedo stopped. Time for a new cable I thinks, so I got one on fleabay. After fitting all was well a few hours, and it stops again. I figured I had bought a naff one, but also observed my routing wasn't very good.
Okay, so I get another speedo from a different source and went to change them over but couldn't find anything wrong with the one I'd just taken off. Fit new one anyway and all was well for a few hours and zunk, it stops again. I take off cable, check it and refit but nothing.  Any ideas what might be happening?

Oddjob:
Speedo drive gears stripped?

Speedo drive not engaged onto drive plate properly?

Second is more likely. Take off the front wheel, pull the spindle out and check the drive engages on the tabs of the drive plate. If it's been like that for a while expect some damage, may be bad, may be just some scraping.

exvalvesetdabbler:
Is the inner part of the cable  still in one piece? It should just pull out from the front wheel end.  Other than that is the inner too short and not engaging in the Speedo properly.

Also if you whittle down a pencil or round bit of wood with a square end  to fit in the Speedo and spin it anticlockwise the needle should respond.

Regards
Dave

exvalvesetdabbler:
Check that the rubber bonded coupling hasn't disintegrated 182 in the image below.

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For the drive gearbox , 184, you will see two pegs inside just below the seal, you should be able to spin/push that round with a small screwdriver or 3m. Drill bit. Should be smooth and the flat blade that engages with the cable should rotate with it.

Regards
Dave

Athame57:
Thanks for the answers guys. I have notice the snail has a lot of grease around it's lower parts, unusual.  :-\

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