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#36870 03/27/08 3:21 pm
Joined: Sep 2006
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I just received my rebuilt speedometer and also replaced both the cable (new) and the gearbox (good used). Went for a ride and the needle was smooth and steady, really nice, not a long ride but about 1/2 mile. Next day the needle started jumping at slow speeds and now it's not registering at all? The cable is tight in both ends, and not binding or twisted anywhere? Does the gearbox need to be pressed into the housing with the tab cutouts more than by hand? Any other thoughts? Thanks


Dave Willner
Stroudsburg, PA
70 BSA 441 Victor Special
70 MGB
59 TR3A
BSA on eBay
#36871 03/27/08 3:45 pm
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Not sure what the exact problem is for you, but one thing I've been warned, and seen, is too much cable end up into the speedo. Be sure that the end is not completely bottomed into the speedo, which would cause a preload when the nut is tightened. Try riding a short way with the nut sightly loose. I have also used a variable speed drill at the gearbox end to spin the cable for trouble shooting. You can look at the speedo end, and see if it is spinning smooth, or snapping. Let us know what you find, some of the "rebuilders" are not so great. KC


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
#36872 03/27/08 7:50 pm
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I
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Dave:
what type of speedo are you talking about? from what youve said sounds like a magnetic type?


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#36873 03/27/08 8:01 pm
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Nossingers rebuilt it. It's a Smiths SM5001/05 typical 2:1, and the gearbox is a Smiths BG5330/31. I'll try the drill at the gearbox end tonight as well as loosening the nut at the speedo and testing it out a bit. Thanks


Dave Willner
Stroudsburg, PA
70 BSA 441 Victor Special
70 MGB
59 TR3A
#36874 03/27/08 8:15 pm
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Thinking more,... before you torture the thing any more, check the engagement 1st. Just stick something in the speedo and mark it for depth. Compare that to the end sticking out of the cable with the gear box end attached as normal. You should be able to see an issue that way. Since you changed the cable, it's more likely. KC


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
#36875 03/27/08 11:37 pm
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I got it to work again, seems that when I tighten the drive nut I think it tends to pull the cable just slighty out of the speedometer. I know a "hand tightened" nut is not the answer...it wasn't a cheap cable, I think its a Barnett? The speedo nut is not overtightened either, just snug. How do you get the "give and take" and the play just right at both ends? Thanks


Dave Willner
Stroudsburg, PA
70 BSA 441 Victor Special
70 MGB
59 TR3A
#36876 03/30/08 10:26 am
Joined: Jul 2004
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Is the inner cable in arse about?

The lug on the inner should be at the speedo end to stop it falling down.


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar
#36878 03/30/08 12:23 pm
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With all the aftermarket cables out there right, how can I be sure I have the right length? Are there any vendors that carry good cables and capable of determing a bike's correct length? Thanks


Dave Willner
Stroudsburg, PA
70 BSA 441 Victor Special
70 MGB
59 TR3A
#36879 03/30/08 8:32 pm
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Posts: 346
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Surely someone has a correct working cable to pop out of their speedo and measure the protrusion.

In the meantime, unhook cable from gearbox and hang as straight as possible, and push and pull on inner cable and see if there is sny slack inside speedo head to determine if cable is or is not bottoming out.

If you have some play, then wrap some tape around cable so as not to damage the square end with 3 jaws, and grab it just enough with a cordless drill and spin it.

Experiment with pushing it in and out to determine if it is engaging in speedo head.


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar
#36880 03/31/08 3:30 pm
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OK, my post is related to the inner cable being too LONG. It sounds like you are thinking the cable is not engaging the speedo, which would be the opposite problem, and so far by my experience, not the case with a new part. If the inner is too long, and you tighten up the speedo nut,it jams the speedo, and breaks it eventually. It's simple. Just check how deep the speedo hole is, and be sure the inner is slightly shorter than that. If ok, then the issue is somewhere else. KC


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
#36881 03/31/08 9:20 pm
Joined: Jul 2004
Posts: 346
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Yeh, too long or too short or wrong size etc.

If this was my bike, I would put it on centre stand and if it has none, jack it up and start engine, raise idle, whack it in top gear.

Then undo the speedo end, see if cable is turning then push it in and out of speedo .

If speedo still don't work, I would grab spinning cable with fingers to make sure it is not slipping in a worn gearbox.

This will eliminate all problems up to the speedo end itself.

Hopefully you will have already determined if the speedo still works with a drill beforehand.

Then I would examine the size/condition of the square hole to the square cable end.

When I was wanting to test my speedo, I had a new MGB cable that screwed onto a chrono speedo, and thought OK, pommie stuff, should work.

It didn't, I thought speedo was dead, it turned out that although the square cable eyeballed the same size, it wasn't, it was very slightly smaller, and it span within the chrono hole.


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar
#36882 04/02/08 4:58 pm
Joined: Feb 2006
Posts: 125
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Hi,

I had the same problem!

Although I didn't change my speedo drive cable I found the speedo worked, then just quit after a short ride.

Try this.

Put the bike on the center stand and remove the speedo drive cable from the gear box.

Put a small screw driver in the gear box output drive and rotate the back wheel. The screw drive should rotate smoothly, else the gear box is broken.

Testing the cable with a cordless screw driver to make the speedo rotate is a good idea here.

Assuming that works, return the cable into the gear box and remove the cable from the speedo. Spin the back wheel and check to see if the cable rotates smoothly, (mine didn't).

Everything tested out OK and the cable ends look perfect! I wrapped the gearbox end of the cable with aluminum foil and reinserted it, finger tight.

Worked perfectly ever since.

Good luck.

Mark


1971 BSA Thunderbolt

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