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Discussion Starter · #1 ·
Both the speedo/tach's on my G-Loria, and my CX custom (both 82's) look to be identical. As I pointed out elsewhere, when I rode G-Loria back from Larry's, I noticed a lot of wild action on the speedo/tach when I'd hit near 70 mph/ 7K rpm. They both fluttered wildly at times, then settle a bit, then go ape again. Slow down some, and they mellowed out a bit. Some fluctuations in other spots, but not very consistent.



On my CX, the speedo/tach are smooth and stable at any spot, no matter if I wind it all the way up.



My question is this. I'm contemplating swapping the sets, but want to maintain the actual mileages. Can this be done by using a drill on the speedo to run them both over the top and start over, then get to where they need to be? And how long would you suppose that would take? It would be interesting to know what equation for revs of drill vs. time to see what the amount of time would be.



Curious to see what you guys/gals think.



Joel in the Couve
 

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It takes a long time with a drill.







But is possible.

The gauges can be opened, and the mileage can be changed rather easily.

But the drill is easier
 

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Easy is what I need. So how long is long? An hour? A day? God forbid a week?
 

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Ah, good question. The CX has roughly 26+K miles, and the G-Loria has about 12+K miles.









*although you could have seen that in my sig line*
 

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I can't say but can't you just put the Drive end of the speedo cable into a drill chuck and get going and you will soon know how long it would take?



I don't know which way the drive cable spins so a reversible drill would be best.
 

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I have done this when I swapped out speedos and wanted to keep the approx same mileage. I used a small motor from a bathroom exhaust fan that I coupled to the speedo with a short bit of tubing and a adapter. I'm not sure of the RPM's of my motor, but I think it was in the range of 1500 RPM's. It would take about 80 miles per hour off the odometer when connected. So, taking a large amount off quickly wouldn't work with this setup.



When I was younger (read stupider), I tried hooking a high speed die grinder/Dremel up to a speedo in an old Triumph. It took less than 5 minutes for the plastic gears to get hot enough to melt down. So, be careful on how fast you spin them. I think anything around 100 MPH would be safe, but monitor the process to avoid disasters.
 

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Not sure if they will reduce by running them backwards

but in forward mode at say 60mph they will change a mile a minute

120mph 2 miles minute

1000 miles at 60 mph will take about 16 and a half hours



spinning the 12k clock up to 28k will take about ten days at 60 mph !!!



theres got to be a better way
 

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Is it possible the bouncing has more to do with his cables then the gauges?
 

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Absolutely!!! The cable is less like a cable, and more of a spring. And they do NOT like to be bent tightly. I've broken 2 good ones.
 

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Do these cables make squeeky noises when/if they need lubrication? I have a squeeky kind of noise at low speed that I can't figure out where it's coming from and it only does it when the bike is in motion.
 

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I noticed a lot of wild action on the speedo/tach when I'd hit near 70 mph/ 7K rpm. They both fluttered wildly at times, then settle a bit, then go ape again. Slow down some, and they mellowed out a bit. Some fluctuations in other spots, but not very consistent.


The tach on my project GL started doing the same during the MN Spring Ride last week, it was starting to fluctuate pretty well around 7k. Changing the cable is now on my to-do list.



If you have a spare set of gauges that you know are stable, can you mount them now as a test before you try to adjust mileage? If they bounce on the GL then you know it is a cable issue and you don't need to mess with the odometer.
 

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I'd go with the cables first, at least pull them off the gauges and see if you can pull them out, if they come out, or move much at all, or you can spin that end then the cables are dying, well, if it comes out, then it's totally dead. If you do the cables, make sure you run them properly so you don't break them again in another month, I went through 3 used speedometer cables and broke 1 30 yr old tach cable
 

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Discussion Starter · #17 ·
Thanks for all the ideas gang. I could try to fit my CX gauges and see if it follows. Only thing about that is this is the type of fiddling I can't do on my own with my hands the way they are. Since this was the restore GL that Larry did, I'm working with him on seeing what we can do. I suppose the fairing would have to come off to do either the swap or the cable change. Calling all local guys with wrenches!!! LOL
 

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I´ve only got some limited experience of this:



As a young guy I fiddled a couple of times with the speedo / odometer on my -60 Chevy Bel Air. Very easy to take apart and adjust to whatever you liked.... the digits even lined up nicely afterwards...



The Chevy instrument practically fell apart if you told it to. The CX speedo is trickier (more complicated) to dismantle but it´s possible.



I´ve heard a lot of this "adjusting with a handheld drill" method.



I had a CX instrument I wanted to adjust. Tried my handheld Bosch drill. At full revs it spun the speedo at ~ 130 kph. So it´s just to use some maths to know how many days (weeks) it´ll take to adjust the odo reading to what you want it to be.



24 hrs continous would give you 3120 kms.



Backwards isn´t possible, only forward.



Sture
 

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Yes they can squeak.They aren't expensive to change but can be tricky to get to.
Well my tach cable is already broken so I just have to find the time to take the good one off the parts bike and install it. The parts bike is down to just engine, wheels frame so that'll be easy enough to remove. I'll have to reserve an afternoon to remove/replace all the stuff on the running bike to install the working one.



Should I squirt any kind of lube down the liner of the speedometer cable to reduce the squeeking? It sounds like a herd of mice or squirrels!
 
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