CL77 Speedo Question

[husabob]

All, I recently replaced my inner and outer speedo cable, properly lubed and installed. Speedo has 3.3K miles. I took my CL77 for a ride yesterday. The temps were in the high 40's(f). The speedo started out indicating accurately and steadily, then suddenly climbed erratically and pinned at over 100 mph. To prevent damage, I disconnected the cable and finished my ride. Any thought about what is causing this behavior? Thanks, Bob B.

[DONZIE]

CHECK TO BE SURE THE INNER CABLE IS NOT "TOO" LONG & RUNNING IN A BIND

[rustywrench]

I've seen this very problem before. Most likely a dry bearing in the lower end of the unit itself. If memory serves, G-man has a tutorial on the repair. Not too difficult to do. Rusty

[conbs]

There are three bushing point in your speedo. From what you describe it sounds like the middle one is where the problem is. That would require at least taking it apart at the glass/bezel. Be very careful prying the bezel up. Take your time. they are brass (I think) and will split if you try to move things too much at a time. Work you way round and round and eventually it will come up enough to slide off. Someone on this site suggested using paint can openers. I have a large selection in different sizes and shapes. I can always make one work no matter where I am in the process.

The problem joint is down inside the two cups. It is hard to lube it without further disassembly but, can be done.

It would be best to take it completely apart and get everything clean down inside the cups. While you have the glass off, it is not that much more effort. As long as you don't screw up the little watch spring, it should work when reassembled. The watch spring was set at the factory. it is very fragile. Once you get the faceplate off, put the needle back on to hold that top shaft to protect the watch spring.

Get everything cleaned really well and lubed and it should work great. The only thing that will change that is if a bushing is ruined or a part is too rusted to function. There is very little stress on any of the parts so, as long as everything moves well it should work.

The worst that can happen is you will break the spring. As long as you don't lose any of the little parts, you can box the whole thing up and send it off to someone to repair it. They will have a spring. I think Foreign Speedo in Sand Diego is recommended pretty highly.

I hope that helps.

Use a synthetic oil from a bicycle shop to lube things on reassembly.