Cb400f speedometer size

[Yad]

Hi all ,
in the process of finishing cr750 replica,looking for rough size of cb400f speedometer,thinking of using instead of cb750 clock as it's to big for the space I have.
Thanks

[Athame57]

The CB400f speedo has a four inches diameter at it's widest. I just gave away my spare so I can't help there. But if you decide it's what you want you can get very good replica's on the David Silver Spares site, just assuming they will still be accurate on your bike. Here are my own:

[Yad]

Hi,
Thanks for reply,I did not get any clocks with bike so have nothing to cross reference with,looking at pictures I thought the 400 clocks were smaller than the 750,I am looking to purchase some but was wanting to stay with original honda look

[Yad]

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[Bryanj]

Depends on size of wheel, if its 19 inch you need a UK 500 or an early 450 twin one. The 400 was a different ratio

[Yad]

Hi
19inch wheel,do you no what ratio I will need?
Thanks

[Oddjob]

Use one off a 500-4, that had a 19” front wheel

[exvalvesetdabbler]

I thought all of the Jap bikes from the 70s had the same ratio on the speedos , 2240 rpm on the speedo input shaft  for 60 mph.  Any gearing for wheel size is done at the drive housing on the axle.

Tacho's are a little different between bikes.

Honda 7:1   , newer VFR/CBR 4:1
Yamaha 5:1
Kawasakii  5:1
 

Regards
Dave

[McCabe-Thiele (Ted)]

Smiths speedometer clocks had the Wey speed printed on the dial face back in the 1960's.

[Athame57]

Smiths speedometer clocks had the Wey speed printed on the dial face back in the 1960's.

I've been trying to figure out what Wey speed is over my morning coffee.   Mixed results on google.

[McCabe-Thiele (Ted)]

It's a term I heard back in the 1960s when my Moggie 1000 had a silver faced speedometer and I replaced it with a black one from a Mini. I assumed it was an engineering term iirc it was a four figure number that represented a number of rotations over a fixed distance. Of course the term might have been wrongly remembered by me, it appears TPM might be the correct term.

[Athame57]

I see Ted. I've learnt what a Moggie 1000 is now too. Still India's national car isn't it not?

[Bryanj]

Nope, that is the Oxford i think, bit bigger

[Oddjob]

A Morris Oxford is substantially bigger. My Dad had both a Moggie and an Oxford back in the day. I was driving the Oxford when it got ripped into 2 parts by a drunk driver doing over 100mph in a Daimler Sovereign, ripped the engine bay right off the car, left me with my feet dangling in the air as the firewall went with the engine. Broke my neck at the same time, put my head through the roof (hence the neck) and put my shoulder so hard into the door it burst the lock. Closest I've come to dying, no idea how I walked away from that accident. It was 3 weeks before they spotted the broken neck, still hurts in cold weather and if I wear a helmet too long.

[Athame57]

Well wow! The things I learn on the SOHC forums!