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Tacho internals

01 Jul 2020 02:57
wayno
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Tacho internals #1
Finally got to the stage of trying to restart my dt400c, started fine after a few good kicks but the tacho/rev counter was sticking and erratic. Upon inspection I could see the piece that the cable screws onto was loose. Stripped the clock and can see that it has come away from the bracket, I have used a bit of araldite to glue it back and is working at the moment, how long for I don't know. For future reference if it doesn't work, are all the counter internals the same as in the framework so I can try and source a damaged one.
Cheers Wayne.

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01 Jul 2020 07:01
DEET
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Tacho internals #2

wayno wrote: ... are all the counter internals the same?


No one knows for sure, but since it is not a precision instrument, it doesn't really matter.

MY OPINION: They are NOT all the same.
If they were, the "0", "5000" and "10,000" marks would all be in the same location on the faces.
For example....1974 DT360 vs. 1975 DT400..... they have different numbers at the 12:00 position. If the internal mechanism was the same, the numbers would be the same.

Another thought.... let's say the difference is in the tach drive. Maybe Yamaha couldn't make the drive gearing work out so that one RPM of the tach cable was the same as all the other bikes. They then had to get Nippon Seiki to make special faces or mechanisms to match.

Whatever the case may be, there are different 0-5-10 points on some of the faces.

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Where the Yamaha Enduro is still a current model...
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02 Jul 2020 01:17
wayno
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Tacho internals #3
thanks for the reply, I was hoping to be able to just use the tacho drive which is attached to the "U" shaped bracket and the rest being my originals. going to have to look for a damaged dt400 tacho.

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02 Jul 2020 01:46 02 Jul 2020 01:47 by Gr8uncleal.
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Tacho internals #4
Not a promise and I'd need to check, but I might have a working one knocking around in the garage somewhere - the 74 to 76 DT250, 360 and 400 all shared that part.

Let me know if you're interested.

Edit - and I am in the UK!
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02 Jul 2020 03:29
wayno
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Tacho internals #5
that would be great.

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02 Jul 2020 04:10
yamahoper
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Tacho internals #6
I have had the same issue with several meters. I tried to find a repair I did and posted pictures... could not locate. I used some washers and some longer screws that hold the mechanism to the cup. It seemed to be a good fix. My first attempt was like yours with glue. Its still holding but my confidence is not great on its longevity.
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02 Jul 2020 04:17
yamahoper
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Tacho internals #7

Found the picture on my desktop
The washer needed some notching for the screws to get by. I used a hand grinder.

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02 Jul 2020 23:38
Gr8uncleal
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Tacho internals #8
Wayne

Do you want to try this repair first?

Alan

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03 Jul 2020 04:07
wayno
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Tacho internals #9

Gr8uncleal wrote: Wayne

Do you want to try this repair first?

Alan


I think yamahoper had a different problem, the 2 screws hold the cup to the bracket just fine. my issue is the tacho drive has come away from the internal "u" shaped bracket which is then screwed to the cup, should have taken a pic before reassembly.

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03 Jul 2020 04:46
Gr8uncleal
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Tacho internals #10
OK.

Here's the one I got from the US for my DT360A.

My original one had sand or suchlike in it and I assumed that it would be a goner. However, after fitting the replacement to my bike, I arsed around with the original and think that it's probably now ok (I'll need to double check that).

I don't know how the condition compares to your speedo - obviously you don't want a mismatched pair. Anyway, post here what you think.

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