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#807262 04/30/20 11:25 am
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Work on the 650 race motor is going forward. It has a 4 plug head using 2 harley coils. The electronic tach that I used when the bike had 2 plugs and 1 coil did not play well with the new setup. I'm considering a mechanical tach this time. I'm aware that Smith made a race tach but so far have not found much info on them. Anyone know of any other options? I hesitate to use the standard magnetic types as I've seen too many of them get erratic when the revs get high.
Thanks-

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Mike Baker #807281 04/30/20 2:29 pm
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Google Scitsu tachometer. UK product used by many racers. They are electronic and have models with their own battery...


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Mike Baker #807314 04/30/20 8:20 pm
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I have 2 Scitsu tachs, neither one has worked as I felt it should. Both were given to me- there could be a reason they were free.
But thanks for bringing it up. They can be sent in for a factory service and maybe be what I need.

Mike Baker #808499 05/10/20 8:09 pm
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Before the Scitsu owner sold out a few years ago, I had trouble with both of mine, on my Triumph 750 Sportsman and my Yamaha F500, trouble with the internal batteries and charging, and he suggested I send them back and he modified them to be powered by an external 9 volt battery pack. One new battery every race weekend, no problems with charging internally, worked great. Don't know if the new owners would do this for you though.

Mike Baker #809129 05/16/20 8:09 pm
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I have a Smiths Electronic tach fitted, its excellent, only downside is it switches off when t battery volts get low. This is not much of a downside, and has actually helped in fault finding when I had a bad ignition switch. It wasnt cheap, quality is high and its very steady in operation.

Last edited by gavin eisler; 05/16/20 8:10 pm.

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Mike Baker #809763 05/21/20 5:23 am
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Mike, I forgot to mention, I used it the Scitsu on my twin plugged Triumph. Worked fine.

Mike Baker #810820 05/30/20 11:28 am
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I don't know about those people at scitsu- won't answer emails.
Anyone got ideas on how to reprogram a tach wired for a points single to work for a Boyer twin?

Mike Baker #810887 05/31/20 5:48 am
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Can you tell the tach to work as a 2 stroke? With the EI it fires every stroke so this is ideal. As for wiring I’ve found that it connects to the pulse side (black wire side) of the coil just the same.


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Mike Baker #810899 05/31/20 11:51 am
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Scitsu programs their instruments at the factory. I'm just wondering about a backyard work around.

Mike Baker #810908 05/31/20 1:02 pm
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I have a black wire Scitsu , for a magneto. Could never get it to work right. Put it on a 2005 Sportster works perfect.


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Mike Baker #810909 05/31/20 1:06 pm
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Change the numbers on the dial face. 4000 rpm on the single cylinder points model Scitsu now equals an actual 8000 rpm - - so don't go there or you might blow the motor! (Sorry, I couldn't help it.)

Last edited by koncretekid; 05/31/20 1:09 pm.

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