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Overdrive conversion speedo error 120-130 1963

posted by  nglasson221 on  Sun Jul 1 15:21 CST 2007
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last visit: Tue Dec 3 19:42 CST 2013
[RELATED]

Further progress to report. I have now checked Odometer as well as speedo. Speedo is over-reading by about 10%. Odo is over-reading by about 5%. The Odo could be (mostly?) corrected with a speedo drive cog that has 1 more tooth. The speedo would require re-calibration to get the other 5% error out of it.

Does anyone know for sure what number of teeth corresponds with which colour? What is the standard cog in a 1971 142E J-type M41? The numbers suggest that it might have a 19 tooth at the moment and I need to fit a 20 tooth.






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