The tachometer should be a 4:1, anti clockwise. RC.103 is the original for production Flashes and street twins. It is an 8,000 model. A good chronometric repairman can convert a 2:1 clockwise.
There is a 2:1 angle drive on the ATD cover that when combined with the 4:1 tach head reads correctly. If you need info on the tach drive it is in Know Thy Beast, Figure 23, I believe.
Quite correct David,
pages 189-190 of the third edition.
Just out of interest though, I have always had a 1-1 ratio gearbox on the outfit, all I do is halve the reading on the dial, which happens to have yellow numbers, needle etc., RC115 on the dial. These were quite common I'm told although I have never come across a similar one.
Thanks for checking my work as I was doing it from memory. I would not have called the RC115 common, but I was not around when they were! It is lovely to have an origianl Black Lightning tach.
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