Speedometer replacement

[2_DONE_THE_TON]

hey guys!

i wanna switch my original kz 400 1979 speedos to smaller,more elegant ones. 8)

i heard there are ratios to stick to.where do i get to know which ones will fit?

cheers

 

[harryzet]

1,4 ratio

 

[2_DONE_THE_TON]

thanks for the quick answer!
i found a neat one but theres no ratio to be found:

http://www.wrenchmonkees.com/webshop/instruments/speedometer-1033.html

 

[raoulduke]

thanks for the quick answer!
i found a neat one but theres no ratio to be found:

http://www.wrenchmonkees.com/webshop/instruments/speedometer-1033.html

I own that, it has a 1.4 ratio.
That speedo is from Shinyo, maybe you find a dealer near you that sells one of those.

 

[2_DONE_THE_TON]

ah get it.

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-parts-mini-black-speedo-kilometer-speedometer-15-0020b.html

so the ratio is:

"The speedometer ratio is 60kmh = 1400RPM, illuminated example is only to show the back-lighting and my not reflect the actual gauge."

1,4 = 60 km/h-->is that true?

 

[raoulduke]

I don't know if 1.4 is 60 km/h.

But you can calculate the Ratio on your own. I did that on my Ducati, because I did not know what ratio or (K-Value) I had tu use.


_____
This instruction is valid for cycles, which have a hub drive on the front wheel resp. in the hub of the front wheel or where the distance rpm is taken off at the gear or the rear wheel.

1. The circumference of the wheel, at which the rpm is taken off, can be determined with a measuring tape or through scrolling on a straight line (u measured in cm).

2. Determination of the gear ratio of the existing pulse:

- Screw off the speedometer cable from the original speedometer

- on the now visible square of the speedometer cable you can put on a mark as counting help

- Do 10 turns with the according wheel (front- and rear wheel) and count the speed of the square of the speedometer cable (x)



3. Calculation of the k-value: Insert booth detected values u and x in the following formula:

k=10 * x/u

The result (rounded to one decimal place) gives the k-value of the speedometer. Please, detect the k-value carefully and exactly. An incorrect k-value will lead to a wrong indication of the actual speed.

Source: http://www.mmb-messtechnik.de/index.php?option=com_easyfaq&Itemid=5&lang=en