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Ratio of Mechanical Tach

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30 Apr 2006 10:09 #43906 by Shoey949
Ratio of Mechanical Tach was created by Shoey949
Alright here's the deal. I have an '83 GPZ 550 with an '81 GPZ 550 motor. The motor has a pickup for a mechanical tach but the display uses an electrical tach. The tach is properly wired but something is wrong with the actual mechanism. So I wanted to switch to an aftermarket mechanical tach and just modify the display panel. Was wondering what ration I need and it this would work: cgi.ebay.com/ebaymotors/Motorcycle-Chrom...dZ1QQsspagenameZWD1V ?

Thanks,
Nate
'83 GPz550H2 w/'81 GPz 550D1 engine
Dynojet Stage 3 kit, MAC 4-1, UNI Pods, DYNA coils and plug wires, WG ignition mod

Grand Rapids, MI

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30 Apr 2006 11:13 #43926 by DanOz7Five0
Replied by DanOz7Five0 on topic Ratio of Mechanical Tach
Not really an answer but here is a thread that shows a link to some from Old Bike Barn that look just like the auction one.

kzrider.com/component/option,com_joomlab...atid,4/id,9920/#9920

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30 Apr 2006 22:24 #44075 by loudhvx
Replied by loudhvx on topic Ratio of Mechanical Tach
You can figure out the ratio just by watching the tach drive while turning the engine over by hand.

You should also be able to use an electronic tach, if you want.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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