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What is my speedo ratio?

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23 Mar 2006 10:56 #33732 by elcid
What is my speedo ratio? was created by elcid
I have a 79 KZ650 but I want to switch to a 16 inch rear wheel & a 19 inch front. So what would my speedo ratio be? Would it be the same for tach as well? Doesn't changing the wheel size change the ratio?

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  • wireman
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23 Mar 2006 11:01 #33735 by wireman
Replied by wireman on topic What is my speedo ratio?
if your front wheel is already 19" it shouldnt affect it too much,thats where your speedometer runs from.tach is run off of motor tire size will not affect it.:whistle: goodluck,happy wrenching!

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23 Mar 2006 11:09 #33742 by elcid
Replied by elcid on topic What is my speedo ratio?
Ok so what is the ratio then?

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  • wireman
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23 Mar 2006 12:05 #33758 by wireman
Replied by wireman on topic What is my speedo ratio?
im not sure of the exact ratio;)

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23 Mar 2006 12:20 #33761 by elcid
Replied by elcid on topic What is my speedo ratio?
Ok well how do I know what speedo to get? Does anyone know what the ratio is?

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  • wireman
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23 Mar 2006 12:28 #33763 by wireman
Replied by wireman on topic What is my speedo ratio?
you should be able to use a tach and speedo off a 650,900 0r thousand up to 1980 i believe.do ya need one?

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23 Mar 2006 12:33 #33764 by elcid
Replied by elcid on topic What is my speedo ratio?
Well actually I want to buy a completely different speedo/ tach for it. Something from JP Cycles for example. I just need to know what ratio to get. Does anyone here know this? Surely someone must have installed one of these on their KZ650 with a 19 inch front & 16 on back...

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23 Mar 2006 12:39 #33765 by hwms
Replied by hwms on topic What is my speedo ratio?
I would suggest that you contact some one like JP Cycles (?). Tell them the size wheel you will be running. They, most likely, can tell you what you need.

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23 Mar 2006 13:20 #33770 by elcid
Replied by elcid on topic What is my speedo ratio?
That is a good answer. I will just wait until I have the wheels I am using & then call them & ask. Thanx guys!

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  • wireman
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23 Mar 2006 15:11 #33794 by wireman
Replied by wireman on topic What is my speedo ratio?
if you would have brought up the fact you want to install aftermarket gauges from the start that would have been very helpfull.no biggy;) goodluck,happy wrenching!

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  • Shoe48
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23 Mar 2006 15:26 #33800 by Shoe48
Replied by Shoe48 on topic What is my speedo ratio?
You can figure it out by counting the turns of your tach cable to one turn of the engine ,, I know sounds kinda hard to do .. I ran into this with my Honda a few weeks ago ,, They sent what They thought I needed ,, it was a 1-7 tach I really needed a 1-5 tach ,, how does this work ? one turn of the tach cable , The tach will read 5 RPMs . one turn of the tach cable will read 7 rpms. as you go up the scale say 1000 turns of the tach cable 5000 on the tach so the difference between a 1-5 and a 1-7 ,, is ?? Well it multiplies as you go up the tach RPMS 1000 tach cable RPMS = 5000 1-5 , 1000 tach cable rpms 7000 1-7 so in the beginning it was only 2 rpm off but at the end it is 2000 rpm off ... I am so confused now ,, so I know you are too ... ;) :) :P

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23 Mar 2006 17:23 #33838 by steell
Replied by steell on topic What is my speedo ratio?
Try doing a search both here and in the Archives, I'm reasonably certain that I saw that info posted here in the past.

KD9JUR

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