Using mechanical tacho

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Gt6drummer1
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Using mechanical tacho

Post by Gt6drummer1 » Thu Aug 10, 2017 3:25 pm

Hi all, I have a 92 plate Xj600 which I am in the process of making naked. I have got a speedo and tachometer off a Honda Cb. I have rather foolishly realises late in the day that the tach is mechanically driven. Is there an easy way I can use this on the xj600? I ideally want to keep the tech as it has the idiot lights integrated. One of my thoughts was to try and take the electric drive from my old tachometer and install it in the Honda casing and wire accordingly. Any help much appreciated! :thumbsup:

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Vulcano39
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Re: Using mechanical tacho

Post by Vulcano39 » Thu Aug 10, 2017 4:12 pm

Why using a cb 500 tachos? the xj600n's are quite nice...i know it is hard to find it but it would be easier to install you just have to find a top yoke for the naked version http://www.ebay.com/itm/YAMAHA-XJ600-XJ ... jq&vxp=mtr
Bikes owned:
Famel Foguete (1958) 50cc 1990
Famel 77 50cc (????)1991-1992
Moto Guzzi NTX 750 (1989)1997-1999
Yamaha XJ600S Diversion (1994) 2017-who knows...

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radare
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Re: Using mechanical tacho

Post by radare » Thu Aug 10, 2017 4:25 pm

You can't use the mechanical speedo easily. To do it, you'd need an electric motor which could drive a short tach cable and then run that tach cable to the cb500 speedometer. To drive that motor, you would need a variable voltage source which correlated linearly to the XJ's tach signal. Doable. Not easy.

Do you all have the KZ1000 in the UK?

Gt6drummer1
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Re: Using mechanical tacho

Post by Gt6drummer1 » Thu Aug 10, 2017 4:58 pm

Thanks for the replies guys, much appreciated. I was hoping I may be able to just take the drive unit from the back of the diversion rev counter and fit it in the back of the Honda unit ( if it fitted), If not, I guess it's back to the drawing board! I chose the Honda clocks because of the idiot lights, cost and I couldn't source any X600n clocks. Not much luck on the Kawasaki unit either I'm afraid...

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radare
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Re: Using mechanical tacho

Post by radare » Thu Aug 10, 2017 8:07 pm

Gt6drummer1 wrote:
Thu Aug 10, 2017 4:58 pm
Thanks for the replies guys, much appreciated. I was hoping I may be able to just take the drive unit from the back of the diversion rev counter and fit it in the back of the Honda unit ( if it fitted), If not, I guess it's back to the drawing board! I chose the Honda clocks because of the idiot lights, cost and I couldn't source any X600n clocks. Not much luck on the Kawasaki unit either I'm afraid...
The XJ tach is electric getting its signal from the grey wire coming from the coil. When sourcing an alternative tach, you have to make sure it'll work with the pulse signal the XJ generates.

This one is a little beat up, but this is what you are after. The tach is the important one. Once you have that, any speedometer with a square drive and the same ratio will work (most older Yamaha and Kawasaki speedos will work).

http://www.ebay.co.uk/itm/Kawasaki-Z100 ... Sw-itXrwXa

Alternatively, I'd be surprised if the clocks from something like an XJR1300 wouldn't work, too.

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Vulcano39
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Re: Using mechanical tacho

Post by Vulcano39 » Tue Aug 15, 2017 4:14 am

http://www.ebay.com/itm/Yamaha-XJ650-XJ ... 0005.m1851 another rev counter almost new from a yamaha 650
Bikes owned:
Famel Foguete (1958) 50cc 1990
Famel 77 50cc (????)1991-1992
Moto Guzzi NTX 750 (1989)1997-1999
Yamaha XJ600S Diversion (1994) 2017-who knows...

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radare
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Re: Using mechanical tacho

Post by radare » Tue Aug 15, 2017 9:00 am

Vulcano39 wrote:
Tue Aug 15, 2017 4:14 am
http://www.ebay.com/itm/Yamaha-XJ650-XJ ... 0005.m1851 another rev counter almost new from a yamaha 650
That one is also a mechanical tach and won't work. Note the cable drive on the backside. You need an electronic tach with three wire connector screws instead.

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