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312Icarus
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I went out for a post Thanksgiving ride this morning, a bit chilly but nice noe the less. Tooling along in mid third gear, I look down and notice I'm "doing 60mph!", I shifted into 4th, and was clearly not doing 60! The next time I look I'm doing 90, then 120. The odo is jumping around a bit but still recording, as is the trip odo.

Perhaps coincidently, when I pull into the shop when i get home, there is a faint smell of burning rubber, but i can't seem to find from where. Question is, is my speedo toast, and or what should/could I do about it, and or am i going to further damage it by riding it?

Thanks in advance for any advise,

Icarus

68 R50US

312Icarus
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A bit of an up date...I ran

A bit of an up date...I ran the bike with he headlight bucket open, and put it in gears. The speedo howls at higher RPMs in taller gears. It is also (relatively) cold out, perhaps 45f. Question is, is there an accepted way to lube the speedo, like with silicone lube? I am very reluctant to take it apart, (even though I have taken lots of older mechanical speedos apart) simply because they are expensive to repair/replace and I don't wish to do any (more() harm.

Icarus

UP,update...i took the speedo out, warmed it in front of the heater, and then used some Tri-flo dry lube on the input spindle, letting it settle in a number of times, then ran the speedo with a cordless drill, giving it a bit more lube. The speedo worked perfectly, so I put it back on the bike and ran it in the shop in 4th gear for a few "miles" and it seems quiet, not bouncing and the odo(s) work fine.

So now the question is, have i hit on a long term solution, or should I send it out for proper lube and service?

Icarus

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6784
I'd cautiously continue to

I'd cautiously continue to use it, but at the first sign of repeated problems, immediately stop using it and get it sent out for repair. These things are pretty precious and if they get internally damaged, the price sky rockets to get them fixed.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

312Icarus
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Posts: 409
Thanks for the advice...My

Thanks for the advice...My guess is i should contact a good speedo guy (Pablo Alto Speedometer) and have it taken apart and re lubed. I can drive it though the winter on occasion with no speedo.

Icarus

312Icarus
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Speedo update

So, I got the original working just fine. I did get a number of quotes for rebuilding/servicing the original, ranging from ~$200-400, quite steep imho. So I bought a $50 repro speedo on Ebay. Looks fine, albeit not original and seems to be quite accurate, but I haven't timed it or driven it over a measured mile(s), but close enough for me. The bulb lights the instrument better than the original.

So, I'll carefully pack and store the original and keep it so if my heirs want to sell the bike with the original they can, and they can verify the mileage between the original and the new one. Seems I can ride for a number of years on the new one and if it craps, then I can redo the old one.

Icarus

PS. If you followed by headlight (speedo cable caused) fire you might be pleased to know that I was able to get that all sorted and everything once again works fine.

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