Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: Lobo on January 25, 2020, 10:14:44 PM

Title: Speedo conversion to kph.
Post by: Lobo on January 25, 2020, 10:14:44 PM
Beginning to tire of constantly doin’ the math as I drive about a kph country on my mph clocks. Lecram kindly provided me K2 kph faces when I bought new crimp rings, and perhaps the time has come for the change over.
Except I’ve just realised the trip & odometer will still be in miles. Dang.
Anyone know where the difference is... ie within the instrument or speedo drive?
An easy fix... obtainable parts etc?
(I assume the needle will continue to read correctly; as simply against a different linear scale.)
Ta,
Simon
Title: Re: Speedo conversion to kph.
Post by: Bryanj on January 25, 2020, 11:04:12 PM
Clock is different, drive is same
Title: Re: Speedo conversion to kph.
Post by: Seamus on January 26, 2020, 09:46:06 AM
Perhaps a recalibration would do it, or perhaps one of the mechanical speedo healers. Think they are available in mph to kph.
May be a bit fussy to read as KPM clocks have more numbers on the dials
Title: Re: Speedo conversion to kph.
Post by: MrDavo on January 26, 2020, 12:52:54 PM
Tired of having to do mental arithmetic every time the speed limit changed, I sent my CB750 clocks to cb750faces (board sponsors) who converted the speedo properly.

They reset the mileometer as well, so you can convert you kmage into mileage.

It cost a bit, but I was very happy with the result.
Title: Re: Speedo conversion to kph.
Post by: cooleronthecoast on January 26, 2020, 01:09:59 PM
There's a speedo on ebay now in kph, not too expensive:
https://www.ebay.co.uk/itm/Honda-CB750C-CB-750-C-Custom-Japanese-Model-1981-KMH-KPH-Speedometer-Speedo/352569470691?epid=13028108583&hash=item5216c72ee3:g:UWYAAOSwEqVcPeDx
Title: Re: Speedo conversion to kph.
Post by: Lobo on January 26, 2020, 10:20:00 PM
Thanks all for your inputs... amazingly I’ve since located a ratty K2 KPH speedo not far away from me here in QLD at £145 or thereabouts. I’m considering it, but as Seamus pointed out, the face does look a bit bloody cluttered. Thanks also Bryan, Davo & Cooler - appreciated.
Title: Re: Speedo conversion to kph.
Post by: bobv7 on January 27, 2020, 09:18:52 AM
There are mechanical drives on the market that change KPH to MPH so maybe there are some that do the reverse?
Title: Re: Speedo conversion to kph.
Post by: Lobo on January 27, 2020, 10:57:02 PM
...thanks Bob; never come across these before.

Tbh though, I can’t see it working, as presumably it factors the output shaft (eg) to 62% of input when converting kph to mph.
Fine for the odometer.... but the speed needle will then only read 62% of full scale... meaning you’d need a very non-standard face plate?

And admittedly I should have thought of this before asking whether it was a simple speedo drive part change. Doh!

Cheers,
Simon.
Title: Re: Speedo conversion to kph.
Post by: Crispy on February 23, 2020, 09:44:38 AM
Hi Lobo,
Did you get sorted? Sorry, only just seen this thread, I've not visited the forum for a while. I have a decent K2 speedo in  kph that I'm not using.
Title: Re: Speedo conversion to kph.
Post by: Lobo on February 23, 2020, 11:34:35 AM
Hey Crispy,
Kind of you - thanks. In the end I took a punt and bought the £145 (260AUD) one off local eBay - it seems in good internal condition. To keep it a matched pair I’ll transfer it’s innards over to my casing using Lecram’s KPH face. (my RPM is also LECRAMs face)
Much appreciated, thanks again for the offer.
Simon.
Title: Re: Speedo conversion to kph.
Post by: Crispy on February 23, 2020, 11:41:09 PM
Hey Crispy,
Kind of you - thanks. In the end I took a punt and bought the £145 (260AUD) one off local eBay - it seems in good internal condition. To keep it a matched pair I’ll transfer it’s innards over to my casing using Lecram’s KPH face. (my RPM is also LECRAMs face)
Much appreciated, thanks again for the offer.
Simon.


No Worries, glad you're sorted!
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