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Author Topic: 1980 CB650C Tachometer Cable to RPM ratio  (Read 1395 times)

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Offline CBJoe

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1980 CB650C Tachometer Cable to RPM ratio
« on: March 05, 2007, 08:44:43 AM »
OK.... so i've got a Shimpo ST-207B Digital Tachometer/ RPM guage.   I want to make an adapter for it so that i can hook the  Tachometer Cable to it and use as a precision tachometer tool.

Is it a 1:1 ratio between 1 RPM and 1 turn of the tachometer cable? If not what is the ratio.

Many thanks
Joe
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Offline Bodi

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Re: 1980 CB650C Tachometer Cable to RPM ratio
« Reply #1 on: March 05, 2007, 09:46:57 AM »
From memory, Hondas below 550cc have a 1:7 ratio and 550+cc go to a 1:4 ratio, 4000RPM engine speed = 1000RPM cable speed. Pretty easy to check by turning the crank and looking at the cable end though.
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