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speedometer relation to odometer

  • Thread starter Thread starter snicrep5
  • Start date Start date
Speedo and Tach

Speedo and Tach

Just was reading the thread on this. My speedo is about 10-12 mph too slow and my tack is way off too, probably by 2500 to 3000 rpms. So if I understand this right, I can reposition the needle to some what make it what it should be? I tried prying both off with no luck, maybe I wasn't using enough force? Any suggestions? I'm actually looking to install a Vapor system on my bike and just get rid of the garbage there now.
 
IME, (In My Experience) a tach which is off calibration by much is best replaced. The obvious issue is what can happen if you are even a small percentage off when over red line, especially with old machinery. But you already knew that so apologise for mentioning.;)

Sometimes the needle can be tough to pull. I have had to place some blocking across the face and to use two fork shaped panel clip tools. I have used a solder gun placed against the shaft while pulling on the needle hub to loosen but one has, obviously, to be quick.

It is always a bit frightening to recommend pulling & prying, especially on old parts, plastic in particular, as I do it by "guess and by-golly" and have no way to convey an impression of my own best judgments or that they are well taken.

One acqauintence mentioned that he was unable to release a speedo needle hub and so cracked the hub axially in order to effect the release. He placed a notched fulcrum (wood likely) against one side of the hub's lower section and then used a home-made tiny chisel to crack the hub parallel to the needle shaft (axial manner). He was then able to withdraw the hib from needle. Can't recall having done that but may have used the technique as it is common trade practice for removing seized nuts.

Before trying that on an old piece of plastic, I think I'd be using a Dremel and tiny burr to groove the hub in order to release the grip.

Hoping some of the above is useful. Will you please keep us posted as to your thoughts and progress?


mrbill5491 said:
Just was reading the thread on this. My speedo is about 10-12 mph too slow and my tack is way off too, probably by 2500 to 3000 rpms. So if I understand this right, I can reposition the needle to some what make it what it should be? I tried prying both off with no luck, maybe I wasn't using enough force? Any suggestions? I'm actually looking to install a Vapor system on my bike and just get rid of the garbage there now.
Click to expand...
 
Maybe not the type of fork I use....you have no idea of the wrath my wife would visit;), and since I'm much more afraid of her than I am of you, I'll ignore the recommendation.:)


hampshirehog said:
A fork (type you eat with) can be useful for prying a needle off and keeping the pressure even.
Click to expand...

Kidding aside, did forget to mention earlier, if one is correcting/recalibrating an instrument it is well to consider whether the calibration is off by a fairly uniform percentage which will be addressed by repositioning or whether there is some other issue which would not support this solution. I like to use a GPS or other, known good, reference to compare the calibration throughout the useful range of the instrument.

Far a speedo, very low speeds are ignored in my view as the need for an accurate measure is low. Speed measure is always a compromise when using a mass produced mechanical device such as the traditional units used on GS and older automobiles. One needs to consider at which speed the speedo is best to be the most correct and so how much compromise is able to be borne within other speed ranges.

Having the speedo read very accurately at 10 mph or 125 mph with poor accuracy at 50 mph would, IMO, be poor practice. Bike speedos which I have checked are always wildly optomistic at higher speeds bu who cares? The court transcript will contain accurate and well vaidated figures for reference.:eek:

Fuel gauges are typically a compromise but are easily referenced by simply measuring the actual fuel at two or three important levels.
 
Speedo/Tach repair

Speedo/Tach repair

Thanks for the suggestions, though after looking at this Vapor unit, I may just go that route. Looks easy enough to set up though not sure how I'm going to mount it inside my existing cluster. Gonna study on it over the winter then tackle it unless y'all have some suggestions for that as well, all are welcomed.
 
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