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Discussion Starter · #1 ·
has anyone used a yamaha speedo or tach from Mike XS on and old honda?

http://www.xs650direct.com/products-46.html

also if GB, Bill, Steve or any twin guru could shine some light on my question in my other thread, i can carry forward on my engine. (CB350G Engine Overhaul)

always appreciated.

dan
 

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Sensei
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MOST Yamaha speedos have the same internal gearing as the Honda units...They read correctly assuming the wheel and drive are originally matched for the wheel size...
 

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Tachs for Hondas need a 20:3 ratio. Not typical for aftermarket mechanical tachs. Sorta a PITA.
As far as an electric tach, you need one that is suitable for a single...I think. Seems most electric tachs are good for 4 cylinder engines. Generally no settings for 2 or 1 cylinders.
Any ideas?

NE
 

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Hi CurbTiger
20:3 may be the correct tachometer drive ratio for some Honda tachometers but Honda has used more than one drive ratio.
It is common for single cylinder electronic tachometers to set up for a spark every revolution. This would work on a 360 degree crank twin. I recently bought a digital tachometer/hour meter from E-bay which can be switched. This is the type that a wire is wrapped around a spark plug wire. I bought this for use on my Super 90. On the rest of my Hondas I have the correct Honda tachometer for that model so no problem.
TomC in Ohio
CurbTiger said:
Tachs for Hondas need a 20:3 ratio. Not typical for aftermarket mechanical tachs. Sorta a PITA.
As far as an electric tach, you need one that is suitable for a single...I think. Seems most electric tachs are good for 4 cylinder engines. Generally no settings for 2 or 1 cylinders.
Any ideas?

NE
 
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