Topic: Speedo Drive Ratio

[72cafe]

Does anyone know the ratio on the K1 speedo? I'm looking at a 0-120 mph Beemer headlight/speedo unit. the final ratio is 25:8.

[eurban]

As far as I know all the SOHC have speedos with the ratio of "2240:60"  which I think means that at 60mph the speedo cable is spinning at 2240 rpms.  This is the same ratio used by Harley on some of its bikes which means that you can find a number of aftermarket guages that are calibrated correctly for the SOHC Honda's.  Most of the aftermarket guages also are set up to accept the 12mm (i think) speedo cable to guage fitting that is stock on the SOHCs.  The ratio you mention on the beemer would seem to be way off but I don't know if it measuring something else.

[smashedmelon]

As far as I know all the SOHC have speedos with the ratio of "2240:60"  which I think means that at 60mph the speedo cable is spinning at 2240 rpms.  This is the same ratio used by Harley on some of its bikes which means that you can find a number of aftermarket guages that are calibrated correctly for the SOHC Honda's.  Most of the aftermarket guages also are set up to accept the 12mm (i think) speedo cable to guage fitting that is stock on the SOHCs.  The ratio you mention on the beemer would seem to be way off but I don't know if it measuring something else.

Sorry to drag up an old post, I looked long and hard for this info regarding speedo/cable retrofitting. The speedo I'm looking at (drag specialties) is 2240:60 (which is correct) BUT it advertises taking a 12mm cable. Can anyone confirm if this is the right (stock cb750k3) cable connection?